Go/github.com/mattermost/mattermost-server/v5 CVE-2026-3590: medium 6.5, EPSS 0.15%
Mattermost has session spoofing due to lack of single-use consumption of guest magic link tokens enforcement 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-2026-5507#Go/github.com/mattermost/mattermost-server/v5
- nvd: CVE-2026-3590
- https://github.com/advisories/GHSA-mh4x-rmrx-3hp4
- https://mattermost.com/security-updates
CVE-2026-3590 · published · modified · JSON