Go/github.com/mattermost/mattermost-server/v5

Mattermost Fails to Properly Validate Team Role Modification

Modified: 8/29/2025

Mattermost vulnerable to cross-site scripting (XSS)

Modified: 12/6/2023

Mattermost vulnerable to information disclosure

Modified: 12/6/2023

Mattermost fails to properly authentication inviter's permissions to private channel

Modified: 12/6/2023

Mattermost Fails to Validate File Paths

Modified: 8/29/2025

Mattermost has Potential Server Crash due to Unvalidated Import Data

Modified: 8/29/2025

Cross-site Scripting in Mattermost

Modified: 8/21/2024

Mattermost Server Sensitive Data Exposure

Modified: 8/14/2025

Mattermost fails to properly restrict access to archived channel search API

Modified: 11/17/2025

Mattermost Incorrect Authorization vulnerability

Modified: 11/17/2025

Mattermost Fails to Validate Remote Cluster Upload Sessions

Modified: 8/29/2025

Improper Privilege Management in Mattermost

Modified: 8/21/2024

Mattermost Does Not Sanitize the Team Invite ID

Modified: 8/29/2025

Mattermost Server Resource Exhaustion

Modified: 12/18/2024

Mattermost password hash disclosure vulnerability

Modified: 7/22/2025

Mattermost did not properly restrict channel creation

Modified: 7/25/2025

Mattermost Fails to Sanitize Path Traversal Sequences

Modified: 8/29/2025

Mattermost users could access some sensitive information via API call in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Insecure plugin handling in Mattermost in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Resource exhaustion in Mattermost in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Improper Control of a Resource Through its Lifetime in Mattermost in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Cross-site Scripting in Mattermost in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Improper Privilege Management in Mattermost in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost Server Sensitive Data Exposure in github.com/mattermost/mattermost

Modified: 3/3/2026

Mattermost allows demoted guests to change group names in github.com/mattermost/mattermost-server

Modified: 2/4/2026

Mattermost Cross-site Scripting vulnerability in github.com/mattermost/mattermost-server

Modified: 2/4/2026

Mattermost notified all users in the channel when using WebSockets to respond individually in github.com/mattermost/mattermost-server

Modified: 2/4/2026

Mattermost viewing archived public channels permissions vulnerability in github.com/mattermost/mattermost-server

Modified: 2/4/2026

Mattermost vulnerable to denial of service via large number of emoji reactions in github.com/mattermost/mattermost-server

Modified: 2/4/2026

Mattermost fails to check the required permissions in github.com/mattermost/mattermost-server

Modified: 2/4/2026

Mattermost race condition in github.com/mattermost/mattermost-server

Modified: 2/4/2026

Mattermost denial of service through long emoji value in github.com/mattermost/mattermost-server

Modified: 8/7/2026

Mattermost leaks details of AD/LDAP groups of a teams in github.com/mattermost/mattermost-server

Modified: 8/7/2026

Mattermost post fetching without auditing in compliance export in github.com/mattermost/mattermost-server

Modified: 2/4/2026

Mattermost allows attackers access to posts in channels they are not a member of in github.com/mattermost/mattermost-server

Modified: 2/4/2026

Mattermost fails to check the "invite_guest" permission in github.com/mattermost/mattermost-server

Modified: 2/4/2026

Mattermost fails to limit the number of role names in github.com/mattermost/mattermost-server

Modified: 2/4/2026

Mattermost fails to properly restrict the access of files attached to posts in github.com/mattermost/mattermost-server

Modified: 2/4/2026

Mattermost incorrectly allows access individual posts in github.com/mattermost/mattermost-server

Modified: 8/7/2026

Mattermost Server doesn't limit the number of user preferences in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost fails to authenticate the source of certain types of post actions in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost Server Improper Access Control in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost Server Improper Access Control in github.com/mattermost/mattermost-server

Modified: 2/4/2026

Mattermost allows a remote actor to permanently delete local data by abusing dangerous error handling in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost allows remote actor to set arbitrary RemoteId values for synced users in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost allows remote actor to create/update/delete posts in arbitrary channels in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost allows a user on a remote to set their remote username prop to an arbitrary string in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost failed to disallow the modification of local users when syncing users in shared channels in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost failed to properly validate that the channel that comes from the sync message is a shared channel in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost failed to properly validate synced reactions in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost allows a remote actor to make an arbitrary local channel read-only in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost did not properly restrict channel creation in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost allows guest user with read access to upload files to a channel in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost allows team admin user without "Add Team Members" permission to disable invite URL in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost allows user with systems manager role with read-only access to teams to perform write operations on teams in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost allows unsolicited invites to expose access to local channels in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost doesn't redact remote users' original email addresses in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost doesn't restrict which roles can promote a user as system admin in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost allows remote/synthetic users to create sessions, reset passwords in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost Cross-Site Request Forgery vulnerability in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost fails to strip `embeds` from `metadata` when broadcasting `posted` events in github.com/mattermost/mattermost-server

Modified: 2/4/2026

Mattermost incorrectly issues two sessions when using desktop SSO in github.com/mattermost/mattermost-server

Modified: 2/4/2026

Mattermost Server allows user to get private channel names in github.com/mattermost/mattermost-server

Modified: 2/4/2026

Mattermost Server Path Traversal vulnerability that leads to Cross-Site Request Forgery in github.com/mattermost/mattermost-server

Modified: 2/4/2026

Mattermost Server vulnerable to application crash from attacker-generated large response in github.com/mattermost/mattermost-server

Modified: 2/4/2026

Mattermost server allows authenticated user to delete arbitrary post in github.com/mattermost/mattermost-server

Modified: 2/4/2026

Mattermost Server Resource Exhaustion in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost Improper Validation of Specified Type of Input vulnerability in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost Race Condition vulnerability in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost Data Amplification vulnerability in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost Incorrect Authorization vulnerability in github.com/mattermost/mattermost-server

Modified: 2/4/2026

Mattermost Improper Validation of Specified Type of Input vulnerability in github.com/mattermost/mattermost-server

Modified: 2/4/2026

Mattermost has Improper Check for Unusual or Exceptional Conditions in github.com/mattermost/mattermost-server

Modified: 2/4/2026

Mattermost fails to properly validate post props in github.com/mattermost/mattermost-server

Modified: 2/4/2026

Mattermost Incorrect Type Conversion or Cast in github.com/mattermost/mattermost-server

Modified: 2/4/2026

Mattermost fails to properly validate post props in github.com/mattermost/mattermost-server

Modified: 2/4/2026

Mattermost webapp crash via a crafted post in github.com/mattermost/mattermost-server

Modified: 2/4/2026

Mattermost allows reading arbitrary files related to importing boards in github.com/mattermost/mattermost-server

Modified: 2/4/2026

Mattermost fails to restrict channel export of archived channels in github.com/mattermost/mattermost-server

Modified: 2/4/2026

Mattermost fails to invalidate all active sessions when converting a user to a bot in github.com/mattermost/mattermost-server

Modified: 2/4/2026

Mattermost allows reading arbitrary files in github.com/mattermost/mattermost-server

Modified: 2/4/2026

Mattermost Fails to Properly Perform Viewer Role Authorization in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost Fails to Enforce Certain Search APIs in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost Fails to Restrict Command Execution in Archived Channels in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost Fails to Enforce MFA on Plugin Endpoints in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost Fails to Restrict Bookmark Creation and Updates in Archived Channels in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost fail to prompt for explicit approval before adding a team admin to a private channel in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost allows members with permission to convert public channels to private and convert private to public in github.com/mattermost/mattermost-server

Modified: 2/4/2026

Mattermost Fails to Enforce Proper Access Controls on `/api/v4/audits` Endpoint in github.com/mattermost/mattermost-server

Modified: 2/4/2026

Mattermost Fails to Restrict Certain Operations on System Admins in github.com/mattermost/mattermost-server

Modified: 2/4/2026

Mattermost vulnerable to Incorrect Implementation of Authentication Algorithm in github.com/mattermost/mattermost-server

Modified: 2/4/2026

Mattermost Incorrect Authorization vulnerability in github.com/mattermost/mattermost-server

Modified: 2/4/2026

Mattermost vulnerable to Observable Timing Discrepancy in github.com/mattermost/mattermost-plugin-msteams

Modified: 2/4/2026

Mattermost Incorrect Authorization vulnerability in github.com/mattermost/mattermost-server

Modified: 2/4/2026

Mattermost Missing Authentication for Critical Function in github.com/mattermost/mattermost-server

Modified: 2/4/2026

Mattermost Incorrect Authorization vulnerability in github.com/mattermost/mattermost-server

Modified: 2/4/2026

Mattermost doesn't restrict domains LLM can request to contact upstream in github.com/mattermost/mattermost-server

Modified: 2/4/2026

Mattermost Incorrect Authorization vulnerability in github.com/mattermost/mattermost-server

Modified: 2/4/2026

Mattermost Playbooks fails to properly validate the props used by the RetrospectivePost custom post type in github.com/mattermost/mattermost-plugin-playbooks

Modified: 2/4/2026

Mattermost Playbooks fails to validate the uniqueness and quantity of task actions in github.com/mattermost/mattermost-plugin-playbooks

Modified: 2/4/2026

Mattermost Playbooks fails to properly validate permissions in github.com/mattermost/mattermost-plugin-playbooks

Modified: 2/4/2026

Mattermost Fails to Verify User's Permissions When Accessing Groups in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost Fails to Lockout LDAP Users After Repeated Login Failures in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost Fails to Validate Team Invite Permissions in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost Fails to Check User Access to `ExperimentalSettings` in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost improperly allows team administrators to modify team invites in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost fails to properly enforce access control restrictions for System Manager roles in github.com/mattermost/mattermost-server

Modified: 8/7/2026

Mattermost fails to clear Google OAuth credentials in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost fails to properly enforce access controls for guest users in github.com/mattermost/mattermost-server

Modified: 8/7/2026

Mattermost fails to properly invalidate personal access tokens upon user deactivation in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost allows authenticated administrator to execute LDAP search filter injection in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost allows guest users to view information about public teams they are not members of in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost allows authenticated users to write files to arbitrary locations in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost allows an unauthorized Guest user access to Playbook in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost allows unauthorized channel member management through playbook runs in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost Incorrect Authorization vulnerability in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost Incorrect Authorization vulnerability in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost has Insufficiently Protected Credentials in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost Missing Authentication for Critical Function in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost Path Traversal vulnerability in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost Fails to Validate File Paths in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost Fails to Properly Validate Team Role Modification in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost Lack of Access Control Validation in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost Fails to Validate Remote Cluster Upload Sessions in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost Does Not Sanitize the Team Invite ID in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost Server SSRF Vulnerability via the Agents Plugin in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost Fails to Sanitize Path Traversal Sequences in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost Fails to Sanitize File Names in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost has Potential Server Crash due to Unvalidated Import Data in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost Missing Authorization vulnerability in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost Open Redirect vulnerability in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost makes Use of Weak Hash in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost Open Redirect vulnerability in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost Path Traversal vulnerability in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost boards plugin fails to restrict download access to files in github.com/mattermost/mattermost-plugin-boards

Modified: 3/3/2026

Mattermost has a Missing Authorization vulnerability in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost has an Incorrect Authorization vulnerability in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost has a Missing Authorization vulnerability in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost has a Missing Authorization vulnerability in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost has an Observable Timing Discrepancy vulnerability in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost Incorrect Authorization vulnerability in github.com/mattermost/mattermost

Modified: 3/3/2026

Mattermost fails to properly restrict access to archived channel search API in github.com/mattermost/mattermost

Modified: 3/3/2026

Mattermost does not enforce MFA on WebSocket connections in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost allows an attacker to edit arbitrary posts via a crafted MSTeams plugin OAuth redirect URL in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost allows system administrators to access password hashes and MFA secrets in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost allows regular users to access archived channel content and files in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost allows other users to determine when users had read channels via channel member objects in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost Server is vulnerable to a Denial of Service attack through `invite_people` command in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost fails to properly validate OAuth state tokens during OpenID Connect authentication in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost fails to sanitize team email addresses in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost fails to to verify the token used during code exchange in github.com/mattermost/mattermost-server

Modified: 3/3/2026

Mattermost fails to validate user permissions when deleting comments in Boards in github.com/mattermost/mattermost

Modified: 3/3/2026

Mattermost fails to validate user permissions in Boards in github.com/mattermost/mattermost

Modified: 3/3/2026

Mattermost GitHub Plugin Bot Identity Validation Bypass Allows Arbitrary GitHub Reaction Injection in github.com/mattermost/mattermost

Modified: 3/3/2026

Mattermost has missing redirect URL validation in github.com/mattermost/mattermost

Modified: 3/3/2026

Mattermost has an Invite Token Replay Vulnerability via Channel Membership Manipulation in github.com/mattermost/mattermost

Modified: 3/3/2026

Mattermost doesn't validate user channel membership when attaching Mattermost posts as comments to Jira issues in github.com/mattermost/mattermost-server

Modified: 2/26/2026

Mattermost doesn't verify that post actions invoking `/share-issue-publicly` were created by the Jira plugin in github.com/mattermost/mattermost-server

Modified: 2/26/2026

Mattermost with Jira plugin enabled has Incorrect Implementation of Authentication Algorithm in github.com/mattermost/mattermost-plugin-jira

Modified: 3/3/2026

Mattermost fails to properly validate login method restrictions in github.com/mattermost/mattermost-server

Modified: 2/23/2026

Mattermost fails to properly validate team membership when processing channel mentions in github.com/mattermost/mattermost-server

Modified: 2/23/2026

Mattermost fails to enforce invite permissions when updating team settings in github.com/mattermost/mattermost-server

Modified: 2/23/2026

Mattermost fails to sanitize sensitive data in WebSocket messages in github.com/mattermost/mattermost-server

Modified: 2/23/2026

Mattermost fails to properly validate User-Agent header tokens in github.com/mattermost/mattermost-server

Modified: 3/26/2026

Mattermost fails to limit the size of responses from integration action endpoints in github.com/mattermost/mattermost-server

Modified: 3/26/2026

Mattermost fails to bound memory allocation when processing PSD image files in github.com/mattermost/mattermost-server

Modified: 4/16/2026

Mattermost allows a removed team member to enumerate all public channels within a private team in github.com/mattermost/mattermost-server

Modified: 3/23/2026

Mattermost fails to properly handle very long passwords in github.com/mattermost/mattermost-server

Modified: 3/23/2026

Mattermost allows attackers to spoof permalink embeds in github.com/mattermost/mattermost-server

Modified: 3/23/2026

Mattermost fails to bound memory allocation when processing DOC files in github.com/mattermost/mattermost-server

Modified: 3/23/2026

Mattermost fails to preserve the redacted state of burn-on-read posts during deletion in github.com/mattermost/mattermost-server

Modified: 3/23/2026

Mattermost fails to filter invite IDs based on user permissions in github.com/mattermost/mattermost-server

Modified: 3/23/2026

Mattermost fails to use consistent error responses when handling the /mute command in github.com/mattermost/mattermost-server

Modified: 3/23/2026

Mattermost fails to properly enforce read permissions in search API endpoints in github.com/mattermost/mattermost-server

Modified: 3/23/2026

Mattermost fails to canonicalize IPv4-mapped IPv6 addresses before reserved IP validation in github.com/mattermost/mattermost-server

Modified: 3/23/2026

Mattermost fails to validate team-specific upload_file permissions in github.com/mattermost/mattermost-server

Modified: 3/23/2026

Mattermost fails to validate user's authentication method when processing account auth type switch in github.com/mattermost/mattermost-server

Modified: 3/23/2026

Mattermost allows attackers to manipulate administrator terminals via crafted messages containing ANSI and OSC escape sequences in github.com/mattermost/mattermost-server

Modified: 6/25/2026

Mattermost allows system administrators to read arbitrary host files via malicious AdvancedLoggingJSON configuration in github.com/mattermost/mattermost-server

Modified: 6/25/2026

Mattermost has an Incorrect Authorization issue in github.com/mattermost/mattermost-server

Modified: 6/25/2026

Mattermost: Authenticated DoS through failure to prevent rendering of external SVGs on link embeds in github.com/mattermost/mattermost-server

Modified: 6/25/2026

Mattermost does not verify remote cluster channel access when processing shared channel membership removals in github.com/mattermost/mattermost-server

Modified: 6/25/2026

Mattermost doesn't verify channel membership when processing AI-assisted message rewrites in github.com/mattermost/mattermost-server

Modified: 6/25/2026

Mattermost doesn't sanitize sensitive configuration fields before including them in support packet generation in github.com/mattermost/mattermost-server

Modified: 6/25/2026

Mattermost doesn't validate 7zip archive structure before processing in github.com/mattermost/mattermost-server

Modified: 6/25/2026

Mattermost allows attackers to take over arbitrary user accounts via overly permissive substring matching flaw in github.com/mattermost/mattermost-server

Modified: 6/25/2026

Mattermost has an Incorrect Authorization issue in github.com/mattermost/mattermost-server

Modified: 6/25/2026

Mattermost doesn't check if {{team_id}} was being changed when updating playbooks in github.com/mattermost/mattermost-plugin-playbooks

Modified: 6/25/2026

Mattermost doesn't validate that the RefreshedToken differs from the original invite token during remote cluster invite confirmation in github.com/mattermost/mattermost-server

Modified: 6/25/2026

Mattermost doesn't enforce client identity binding during the OAuth authorization code redemption flow in github.com/mattermost/mattermost-server

Modified: 6/25/2026

Mattermost doesn't escape some variables that could contain malicious content during error page composition in github.com/mattermost/mattermost-server

Modified: 6/25/2026

Mattermost doesn't check public/private permissions in github.com/mattermost/mattermost-plugin-playbooks

Modified: 6/25/2026

Mattermost doesn't validate CSRF tokens on an authentication endpoint in github.com/mattermost/mattermost-server

Modified: 6/25/2026

Mattermost has session spoofing due to lack of single-use consumption of guest magic link tokens enforcement in github.com/mattermost/mattermost-server

Modified: 6/25/2026

Mattermost allows authenticated guest users to enumerate user IDs outside their allowed visibility scope in github.com/mattermost/mattermost-server

Modified: 6/25/2026

Mattermost doesn't properly validate CSRF tokens in github.com/mattermost/mattermost-server

Modified: 6/25/2026

Mattermost doesn't check the create_post channel permission during post edit operations in github.com/mattermost/mattermost-server

Modified: 6/25/2026

Mattermost doesn't validate decompressed archive entry sizes during file extraction in github.com/mattermost/mattermost-server

Modified: 6/25/2026

Mattermost doesn't validate the Host header when constructing response URLs for custom slash command in github.com/mattermost/mattermost-server

Modified: 6/25/2026

Mattermost doesn't enforce slash command trigger-word uniqueness during command updates in github.com/mattermost/mattermost-server

Modified: 6/25/2026

Mattermost doesn't prevent disclosure of created user password in github.com/mattermost/mattermost-server

Modified: 6/25/2026

Mattermost doesn't validate the X-Requested-With header on the burn-on-read reveal endpoint in github.com/mattermost/mattermost-server

Modified: 6/25/2026

Mattermost doesn't properly validate msgpack-encoded WebSocket frames before memory allocation in github.com/mattermost/mattermost-server

Modified: 7/7/2026

Mattermost doesn't filter nil elements from outgoing webhook attachment payloads before processing in github.com/mattermost/mattermost-server

Modified: 7/7/2026

Mattermost doesn't validate that a username returned during bot registration belongs to a bot account in github.com/mattermost/mattermost-server

Modified: 8/26/2026

Mattermost doesn't require role-management authorization when setting the scheme_admin flag on group syncable link and patch endpoints in github.com/mattermost/mattermost-server

Modified: 8/26/2026

Mattermost doesn't sanitize FileInfo.Name received from federated peers during shared channel file sync in github.com/mattermost/mattermost-server

Modified: 8/26/2026

Mattermost doesn't sanitize the Remote Cluster API response on PATCH operations in github.com/mattermost/mattermost-server

Modified: 8/26/2026

Mattermost doesn't enforce PermissionInviteUser when setting AllowOpenInvite or AllowedDomains during team creation in github.com/mattermost/mattermost-server

Modified: 8/26/2026

Mattermost doesn't require system-level permission when patching protected default system roles in github.com/mattermost/mattermost-server

Modified: 8/26/2026

Mattermost doesn't restrict role_updated websocket event broadcasts to members of the affected team or channel in github.com/mattermost/mattermost-server

Modified: 8/26/2026

Mattermost has an Incorrect Authorization issue in github.com/mattermost/mattermost-server

Modified: 10/1/2026