CVE-2026-9693 — Mattermost thread memberships persist after team removal, exposing private channel thread metadata on re-invite
Mattermost versions 10.11.x <= 10.11.20, 11.7.x <= 11.7.5 Mattermost fails to remove thread membership records when a user is removed from or leaves a team, which allows a previ…
Published: 2026-08-17 · CVSS: 3.5 · CVSS 3.1
Mattermost versions 10.11.x <= 10.11.20, 11.7.x <= 11.7.5 Mattermost fails to remove thread membership records when a user is removed from or leaves a team, which allows a previously removed user who is later re-invited to the team to view private channel thread root post content and metadata via the team threads API.. Mattermost Advisory ID: MMSA-2026-00682
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7