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GHSA-jwhw-xf5v-qgxc

Mattermost allows guest users to view information about public teams they are not members of

Source: GitHub Advisory Database (reviewed) Low CVE-2025-4128

Packages

EcosystemPackageAffectedFixed in
Go github.com/mattermost/mattermost/server/v8 < 8.0.0-20250422131222-701ddc896a10 8.0.0-20250422131222-701ddc896a10
Go github.com/mattermost/mattermost-server >= 10.5.0, < 10.5.5 10.5.5
Go github.com/mattermost/mattermost-server >= 9.11.0, < 9.11.14 9.11.14

Details

As written in the advisory (Markdown source, shown as plain text).

Mattermost versions 10.5.x <= 10.5.4, 9.11.x <= 9.11.13 fail to properly restrict API access to team information, allowing guest users to bypass permissions and view information about public teams they are not members of via a direct API call to /api/v4/teams/{team_id}.

References

External links from the advisory. They lead to third-party sites.