{"action":"Upgrade github.com/mattermost/mattermost-server to 10.11.18 or later.","affected":[{"fixed":"11.7.1","introduced":"11.7.0"},{"fixed":"10.11.18","introduced":"10.11.0"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2026-8823"],"ecosystem":"Go","epss":0.00318,"exploited":false,"fixed_versions":["11.7.1","10.11.18"],"ghsa_id":"GHSA-xmfh-3ccg-c9fx","id":"tcs_01M5KFSDK5G2Q4616Z9SN7T6CS","modified_at":"2026-10-01T20:56:22.201788989Z","published_at":"2026-06-22T18:34:16Z","references":["https://osv.dev/vulnerability/GHSA-xmfh-3ccg-c9fx","https://nvd.nist.gov/vuln/detail/CVE-2026-8823","https://github.com/mattermost/mattermost/pull/36487","https://github.com/mattermost/mattermost/commit/7972fc53f5c0b0175879a9737308a87b42db1f0b","https://github.com/mattermost/mattermost/commit/9bd77d3fc4d2af3f7f0259a205174e76a1a276e1","https://github.com/mattermost/mattermost/commit/c9bf3609fb9a3e5c2de94c50742c9b91fd723e3d","https://github.com/mattermost/mattermost/commit/d9a55e394cd5bc15edb49e9606bec8fec03ac4c6","https://docs.mattermost.com/security-guide/security-updates","https://github.com/mattermost/mattermost","https://github.com/mattermost/mattermost/releases/tag/v10.11.18","https://github.com/mattermost/mattermost/releases/tag/v11.7.1"],"severity":{"label":"low","score":3.8},"sources":[{"source":"osv","source_id":"GHSA-xmfh-3ccg-c9fx","url":"https://osv.dev/vulnerability/GHSA-xmfh-3ccg-c9fx"}],"summary":"Mattermost has an Incorrect Authorization issue"}