Go/github.com/mattermost/mattermost-server/v5 CVE-2026-27659: medium 4.6, EPSS 0.13%
Mattermost doesn't properly validate CSRF tokens 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-2026-5629#Go/github.com/mattermost/mattermost-server/v5
- nvd: CVE-2026-27659
- https://github.com/advisories/GHSA-rmhw-c3xr-m3xx
- https://mattermost.com/security-updates
CVE-2026-27659 · published · modified · JSON