Go/github.com/mattermost/mattermost-server/v5 CVE-2026-25783: medium 4.3, EPSS 0.30%
Mattermost fails to properly validate User-Agent header 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-2026-4725#Go/github.com/mattermost/mattermost-server/v5
- nvd: CVE-2026-25783
- https://github.com/advisories/GHSA-2v3w-6g35-5f9v
- https://github.com/mattermost/mattermost/commit/1346cf529aef0672c39a56ec10d1b8a9c8fb387d
- https://mattermost.com/security-updates
CVE-2026-25783 · published · modified · JSON