CVE-2026-9693

The record

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

Affected packages

Related vulnerabilities

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• CVE-2026-88932 multer is a Node.js middleware for handling multipart/form-data uploads. CWE-459
• CVE-2026-87776 compression is a Node.js and Express compression middleware. CWE-459
• CVE-2026-87549 Incomplete cleanup in Downloads in Google Chrome prior to 153.0.8010.36 allowed a remote… CWE-459
• CVE-2026-87446 Incomplete cleanup in Extensions in Google Chrome prior to 153.0.8010.36 allowed a remote… CWE-459
• CVE-2026-87436 Incomplete cleanup in Browser in Google Chrome prior to 153.0.8010.36 allowed a remote… CWE-459
• CVE-2026-85043 Incomplete cleanup in Network in Google Chrome prior to 152.0.7977.82 allowed a remote… CWE-459