Mattermost Server 10.11.x < 10.11.16 / 11.5.x < 11.5.5 / 11.6.x < 11.6.2 Multiple Vulnerabilities (MMSA-2026-00616 / MMSA-2026-00649 / MMSA-2026-00655 / MMSA-2026-00656 / MMSA-2026-00661 / MMSA-2026-00662 / MMSA-2026-00665)

The version of Mattermost Server installed on the remote host is affected by multiple vulnerabilities: - Mattermost fails to require role-management authorization when setting the schemeadmin flag on group syncable link and patch endpoints, which allows a user with group-link permissions to...

CVE-2026-7387 Mattermost group syncable endpoints allow privilege escalation via scheme_admin

Mattermost versions 11.6.x = 11.6.1, 11.5.x = 11.5.4, 10.11.x = 10.11.15, 10.11.x = 10.11.16 Mattermost fails to require role-management authorization when setting the schemeadmin flag on group syncable link and patch endpoints, which allows a user with group-link permissions to escalate themselv...

PT-2026-48941

Name of the Vulnerable Software and Affected Versions Mattermost versions prior to 11.6.2 Mattermost versions prior to 11.5.5 Mattermost versions prior to 10.11.17 Description Insufficient role-management authorization occurs when setting the scheme admin flag on group syncable link and patch...

Social Base - Moderately critical - Access bypass - SA-CONTRIB-2022-060

The Social Base theme is designed as a base theme for Open Social. This base theme holds has a lot of sensible defaults. It doesn't however contain much styling. We expect developers to want to change this for their own project. When content within the Open Social distribution is placed within a...