{"schema_version":"1.3.1","id":"GO-2026-6286","modified":"2026-08-25T19:43:10Z","published":"2026-08-25T19:43:10Z","aliases":["CVE-2026-3433","GHSA-rp4v-qc77-phm4"],"summary":"Mattermost doesn't restrict role_updated websocket event broadcasts to members of the affected team or channel in github.com/mattermost/mattermost-server","details":"Mattermost doesn't restrict role_updated websocket event broadcasts to members of the affected team or channel in github.com/mattermost/mattermost-server","affected":[{"package":{"name":"github.com/mattermost/mattermost-server","ecosystem":"Go"},"ranges":[{"type":"SEMVER","events":[{"introduced":"10.11.0+incompatible"},{"fixed":"10.11.17+incompatible"},{"introduced":"11.5.0+incompatible"},{"fixed":"11.5.5+incompatible"},{"introduced":"11.6.0+incompatible"},{"fixed":"11.6.1+incompatible"}]}],"ecosystem_specific":{}},{"package":{"name":"github.com/mattermost/mattermost-server/v5","ecosystem":"Go"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"}]}],"ecosystem_specific":{}},{"package":{"name":"github.com/mattermost/mattermost-server/v6","ecosystem":"Go"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"}]}],"ecosystem_specific":{}},{"package":{"name":"github.com/mattermost/mattermost/server/v8","ecosystem":"Go"},"ranges":[{"type":"SEMVER","events":[{"introduced":"8.0.0-20250731163400-5b955468ea1e"},{"fixed":"8.0.0-20260504071740-9408b98025d7"}]}],"ecosystem_specific":{}}],"references":[{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-rp4v-qc77-phm4"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-3433"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/commit/0a0ab0d54d899d308bd1352cc577036917500318"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/commit/7425c6817bf244f976c729f8a73cecac8039a1e1"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/commit/9408b98025d7364d7dfe7cdb28fcd109b1b595a6"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/commit/a30a331a29b9766d46716d4252056d7b74e66da0"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/pull/35497"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/pull/36256"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/pull/36257"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/pull/36341"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/releases/tag/v10.11.16"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/releases/tag/v11.5.5"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/releases/tag/v11.6.2"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/releases/tag/v11.7.0"},{"type":"WEB","url":"https://mattermost.com/security-updates"}],"database_specific":{"url":"https://pkg.go.dev/vuln/GO-2026-6286","review_status":"UNREVIEWED"}}