Go/github.com/mattermost/mattermost-server/v5 CVE-2026-28759: medium 4.3, EPSS 0.15%
Mattermost does not verify remote cluster channel access when processing shared channel membership removals in github.com/mattermost/mattermost-server
Action: No fix published. Pin and monitor.
Affected
| introduced | fixed | last affected |
|---|---|---|
| 0 | - | - |
Fixed versions
No fixed version in the source.
Sources
- osv: GO-2026-5256#Go/github.com/mattermost/mattermost-server/v5
- nvd: CVE-2026-28759
- https://github.com/advisories/GHSA-8h9w-w78c-vvr3
- https://github.com/mattermost/mattermost/commit/8738f8c4b3d42b2b687a6231e72f313357a2e891
- https://mattermost.com/security-updates
CVE-2026-28759 · published · modified · JSON