MEDIUM 4.3
GHSA-ffpr-pfr4-g354
Mattermost doesn't sanitize team member data when returned via API to users without elevated permissions
Details
Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to sanitize team member data when returned via API to users without elevated permissions which allows a user without permissions to get data about team members roles via invoking various team API endpoints. Mattermost Advisory ID: MMSA-2026-00626.
Are you affected?
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Affected packages
Go / github.com/mattermost/mattermost-server
Introduced in:
11.6.0 Fixed in: 11.6.1 Fix
go get github.com/mattermost/mattermost-server@v11.6.1 Go / github.com/mattermost/mattermost-server
Introduced in:
11.5.0 Fixed in: 11.5.4 Fix
go get github.com/mattermost/mattermost-server@v11.5.4 Go / github.com/mattermost/mattermost-server
Introduced in:
11.4.0 Fixed in: 11.4.5 Fix
go get github.com/mattermost/mattermost-server@v11.4.5 Go / github.com/mattermost/mattermost-server
Introduced in:
10.11.0 Fixed in: 10.11.15 Fix
go get github.com/mattermost/mattermost-server@v10.11.15