GO-2026-4729
Mattermost allows a removed team member to enumerate all public channels within a private team in github.com/mattermost/mattermost-server
Quick fix
GO-2026-4729 — github.com/mattermost/mattermost-server: upgrade to the fixed version with the command below.
go get github.com/mattermost/mattermost-server@v10.11.11+incompatibleDetails
Mattermost allows a removed team member to enumerate all public channels within a private team in github.com/mattermost/mattermost-server.
NOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions.
(If this is causing false-positive reports from vulnerability scanners, please suggest an edit to the report.)
The additional affected modules and versions are: github.com/mattermost/mattermost-server/v5 before v5.3.2-0.20260113182106-a18b80ba4c32.
Are you affected?
Enter the version of the package you're using.
Affected packages
10.11.0-rc1+incompatibleFixed in: 10.11.11+incompatiblego get github.com/mattermost/mattermost-server@v10.11.11+incompatible0No fixed version published yet for github.com/mattermost/mattermost-server/v5 (go modules). Pin to a known-safe version or switch to an alternative.
0No fixed version published yet for github.com/mattermost/mattermost-server/v6 (go modules). Pin to a known-safe version or switch to an alternative.
0Fixed in: 8.0.0-20260113182106-a18b80ba4c32go get github.com/mattermost/mattermost/server/v8@v8.0.0-20260113182106-a18b80ba4c32