{"action":"Upgrade github.com/mattermost/mattermost/server/v8 to 8.0.0-20260313190740-742e0be95074 or later.","affected":[{"fixed":"11.5.2","introduced":"11.5.0"},{"fixed":"10.11.14","introduced":"10.11.0"},{"fixed":"8.0.0-20260313190740-742e0be95074","introduced":"0"}],"component":"github.com/mattermost/mattermost/server/v8","cve_ids":["CVE-2026-4273"],"ecosystem":"Go","epss":0.00142,"exploited":false,"fixed_versions":["11.5.2","10.11.14","8.0.0-20260313190740-742e0be95074"],"ghsa_id":"GHSA-hqpj-f3jh-29vx","id":"tcs_01M5KFCXJXBE383A12WNJ2ABKA","modified_at":"2026-06-25T23:11:31.446397134Z","published_at":"2026-05-18T09:31:47Z","references":["https://osv.dev/vulnerability/GHSA-hqpj-f3jh-29vx","https://nvd.nist.gov/vuln/detail/CVE-2026-4273","https://github.com/mattermost/mattermost/commit/742e0be9507454a7e662668e1d9ec1b94b636e9b","https://github.com/mattermost/mattermost","https://mattermost.com/security-updates"],"severity":{"label":"low","score":3.7},"sources":[{"source":"osv","source_id":"GHSA-hqpj-f3jh-29vx","url":"https://osv.dev/vulnerability/GHSA-hqpj-f3jh-29vx"}],"summary":"Mattermost doesn't validate that the RefreshedToken differs from the original invite token during remote cluster invite confirmation"}