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GHSA-ffpr-pfr4-g354

Mattermost doesn't sanitize team member data when returned via API to users without elevated permissions

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-3636

Packages

EcosystemPackageAffectedFixed in
Go github.com/mattermost/mattermost-server >= 11.6.0, < 11.6.1 11.6.1
Go github.com/mattermost/mattermost-server >= 11.5.0, < 11.5.4 11.5.4
Go github.com/mattermost/mattermost-server >= 11.4.0, < 11.4.5 11.4.5
Go github.com/mattermost/mattermost-server >= 10.11.0, < 10.11.15 10.11.15

Details

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

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.

References

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