GO-2026-6286
Mattermost doesn't restrict role_updated websocket event broadcasts to members of the affected team or channel in github.com/mattermost/mattermost-server
Quick fix
GO-2026-6286 — github.com/mattermost/mattermost-server: upgrade to the fixed version with the command below.
go get github.com/mattermost/mattermost-server@v10.11.17+incompatibleDetails
Mattermost doesn't restrict role_updated websocket event broadcasts to members of the affected team or channel in github.com/mattermost/mattermost-server
Are you affected?
Enter the version of the package you're using.
Affected packages
10.11.0+incompatibleFixed in: 10.11.17+incompatiblego get github.com/mattermost/mattermost-server@v10.11.17+incompatible0No fixed version published yet for github.com/mattermost/mattermost-server/v5 (go modules). Pin to a known-safe version or switch to an alternative.
0No fixed version published yet for github.com/mattermost/mattermost-server/v6 (go modules). Pin to a known-safe version or switch to an alternative.
8.0.0-20250731163400-5b955468ea1eFixed in: 8.0.0-20260504071740-9408b98025d7go get github.com/mattermost/mattermost/server/v8@v8.0.0-20260504071740-9408b98025d7References
- https://github.com/advisories/GHSA-rp4v-qc77-phm4[ADVISORY]
- https://nvd.nist.gov/vuln/detail/CVE-2026-3433[ADVISORY]
- https://github.com/mattermost/mattermost/commit/0a0ab0d54d899d308bd1352cc577036917500318[WEB]
- https://github.com/mattermost/mattermost/commit/7425c6817bf244f976c729f8a73cecac8039a1e1[WEB]
- https://github.com/mattermost/mattermost/commit/9408b98025d7364d7dfe7cdb28fcd109b1b595a6[WEB]
- https://github.com/mattermost/mattermost/commit/a30a331a29b9766d46716d4252056d7b74e66da0[WEB]
- https://github.com/mattermost/mattermost/pull/35497[WEB]
- https://github.com/mattermost/mattermost/pull/36256[WEB]
- https://github.com/mattermost/mattermost/pull/36257[WEB]
- https://github.com/mattermost/mattermost/pull/36341[WEB]
- https://github.com/mattermost/mattermost/releases/tag/v10.11.16[WEB]
- https://github.com/mattermost/mattermost/releases/tag/v11.5.5[WEB]
- https://github.com/mattermost/mattermost/releases/tag/v11.6.2[WEB]
- https://github.com/mattermost/mattermost/releases/tag/v11.7.0[WEB]
- https://mattermost.com/security-updates[WEB]