Go/github.com/mattermost/mattermost-server/v5 CVE-2026-4273: medium 4.3, EPSS 0.14%
Mattermost doesn't validate that the RefreshedToken differs from the original invite token during remote cluster invite confirmation 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-2026-5432#Go/github.com/mattermost/mattermost-server/v5
- nvd: CVE-2026-4273
- https://github.com/advisories/GHSA-hqpj-f3jh-29vx
- https://github.com/mattermost/mattermost/commit/742e0be9507454a7e662668e1d9ec1b94b636e9b
- https://mattermost.com/security-updates
CVE-2026-4273 · published · modified · JSON