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 schem…
Published: 2026-06-12 · CVSS: 8.8 · CVSS 3.1
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 scheme_admin flag on group syncable link and patch endpoints, which allows a user with group-link permissions to escalate themselves and group members to team or channel admin via crafted API requests.. Mattermost Advisory ID: MMSA-2026-00665
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7