{"id":"EUVD-2026-30753","revision":"216c3678127d46b68e771bee41695c12","records":[{"revision":"216c3678127d46b68e771bee41695c12","observedAt":"2026-11-05T10:45:25.584+00:00","statement":{"source":"euvd","id":"EUVD-2026-30753","aliases":["CVE-2026-5163","GHSA-8r89-8w26-cq32"],"title":"Mattermost versions 11.5.x <= 11.5.1 fail to verify channel membership when processing AI-assisted message rewrites which allows an authenticated attacker to read the content of threads in private channels and direct messages they do not ha…","description":"Mattermost versions 11.5.x <= 11.5.1 fail to verify channel membership when processing AI-assisted message rewrites which allows an authenticated attacker to read the content of threads in private channels and direct messages they do not have access to via a crafted request to the post rewrite endpoint.. Mattermost Advisory ID: MMSA-2026-00645","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","score":6.5,"severity":null}],"references":["https://mattermost.com/security-updates"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-30753","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"May 18, 2026, 8:11:13 AM","dateUpdated":"May 18, 2026, 2:40:03 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-30753","identifiers":["EUVD-2026-30753","CVE-2026-5163","GHSA-8r89-8w26-cq32"]},"retained":false,"historicalAffected":[]}],"coverage":[]}