Go/github.com/mattermost/mattermost/server/v8 CVE-2026-3433: unknown, EPSS 0.30%
Mattermost doesn't restrict role_updated websocket event broadcasts to members of the affected team or channel in github.com/mattermost/mattermost-server
Action: Upgrade github.com/mattermost/mattermost/server/v8 to 8.0.0-20260504071740-9408b98025d7 or later.
go get github.com/mattermost/mattermost/server/v8@v8.0.0-20260504071740-9408b98025d7Affected
| introduced | fixed | last affected |
|---|---|---|
| 8.0.0-20250731163400-5b955468ea1e | 8.0.0-20260504071740-9408b98025d7 | - |
Fixed versions
| 8.0.0-20260504071740-9408b98025d7 |
Sources
- osv: GO-2026-6286#Go/github.com/mattermost/mattermost/server/v8
- https://github.com/advisories/GHSA-rp4v-qc77-phm4
- https://nvd.nist.gov/vuln/detail/CVE-2026-3433
- 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/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/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
CVE-2026-3433 · published · modified · JSON