{"action":"Upgrade github.com/mattermost/mattermost-server to 10.11.14+incompatible or later.","affected":[{"fixed":"10.11.14+incompatible","introduced":"10.11.0+incompatible"},{"fixed":"11.5.2+incompatible","introduced":"11.5.0+incompatible"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2026-4273"],"ecosystem":"Go","epss":0.00142,"exploited":false,"fixed_versions":["10.11.14+incompatible","11.5.2+incompatible"],"ghsa_id":"GHSA-hqpj-f3jh-29vx","id":"tcs_01M5KGM8A11APQSPH1RS43WMPE","modified_at":"2026-06-25T23:01:13.302965013Z","published_at":"2026-06-25T22:34:31Z","references":["https://osv.dev/vulnerability/GO-2026-5432","https://github.com/advisories/GHSA-hqpj-f3jh-29vx","https://nvd.nist.gov/vuln/detail/CVE-2026-4273","https://github.com/mattermost/mattermost/commit/742e0be9507454a7e662668e1d9ec1b94b636e9b","https://mattermost.com/security-updates"],"severity":{"label":"medium","score":4.3},"sources":[{"source":"osv","source_id":"GO-2026-5432","url":"https://osv.dev/vulnerability/GO-2026-5432"},{"source":"nvd","source_id":"CVE-2026-4273","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-4273"}],"summary":"Mattermost doesn't validate that the RefreshedToken differs from the original invite token during remote cluster invite confirmation in github.com/mattermost/mattermost-server"}