{"id":"CVE-2026-2461","aliases":["GHSA-hf8w-x9h5-5gf9","GO-2026-4782"],"url":"https://o3.security/vulnerability/CVE-2026-2461","summary":"Missing authorization check allows unauthorized modification of other users' comments on a board","details":"Mattermost Plugins versions <=11.3 11.0.3 11.2.2 10.10.11.0 fail to implement authorisation checks on comment block modifications, which allows an authorised attacker with editor permission to modify comments created by other board members.  Mattermost Advisory ID: MMSA-2025-00559","published":"2026-03-16T11:16:32.720Z","modified":"2026-08-27T03:30:59.345487257Z","cvss":{"score":4.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"},"epss":{"score":0.00162,"percentile":0.05882,"asOf":"2026-08-13"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/mattermost/mattermost-plugin-boards","fixedVersion":"0.0.0-20260108044135-57c5be5b6ef5"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/2xxx/CVE-2026-2461.json"},{"type":"ADVISORY","url":"https://mattermost.com/security-updates"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-2461"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-27T03:30:59.345487257Z"}}