{"action":"Upgrade github.com/mattermost/mattermost-server to 10.11.17 or later.","affected":[{"fixed":"11.6.1","introduced":"11.6.0"},{"fixed":"11.5.5","introduced":"11.5.0"},{"fixed":"10.11.17","introduced":"10.11.0"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2026-3433"],"ecosystem":"Go","epss":0.00301,"exploited":false,"fixed_versions":["11.6.1","11.5.5","10.11.17"],"ghsa_id":"GHSA-rp4v-qc77-phm4","id":"tcs_01M5KFN16Y3BDY4MPTQA5PEEWZ","modified_at":"2026-09-10T03:50:50.492429298Z","published_at":"2026-06-12T18:31:59Z","references":["https://osv.dev/vulnerability/GHSA-rp4v-qc77-phm4","https://nvd.nist.gov/vuln/detail/CVE-2026-3433","https://github.com/mattermost/mattermost/pull/35497","https://github.com/mattermost/mattermost/pull/36256","https://github.com/mattermost/mattermost/pull/36257","https://github.com/mattermost/mattermost/pull/36341","https://github.com/mattermost/mattermost/commit/0a0ab0d54d899d308bd1352cc577036917500318","https://github.com/mattermost/mattermost/commit/7425c6817bf244f976c729f8a73cecac8039a1e1","https://github.com/mattermost/mattermost/commit/9408b98025d7364d7dfe7cdb28fcd109b1b595a6","https://github.com/mattermost/mattermost/commit/a30a331a29b9766d46716d4252056d7b74e66da0","https://github.com/mattermost/mattermost","https://github.com/mattermost/mattermost/releases/tag/v10.11.16","https://github.com/mattermost/mattermost/releases/tag/v11.5.5","https://github.com/mattermost/mattermost/releases/tag/v11.6.2","https://github.com/mattermost/mattermost/releases/tag/v11.7.0","https://mattermost.com/security-updates"],"severity":{"label":"medium","score":4.3},"sources":[{"source":"osv","source_id":"GHSA-rp4v-qc77-phm4","url":"https://osv.dev/vulnerability/GHSA-rp4v-qc77-phm4"}],"summary":"Mattermost doesn't restrict role_updated websocket event broadcasts to members of the affected team or channel"}