Description
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
Problem types
CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
Product status
11.6.0 (semver)
11.5.0 (semver)
11.4.0 (semver)
10.11.0 (semver)
11.7.0
11.6.1
11.5.4
11.4.5
10.11.15
Credits
runup
References
mattermost.com/security-updates (MMSA-2026-00626)