Go/github.com/mattermost/mattermost-server/v5 CVE-2026-6339: unknown, EPSS 0.16%
Mattermost doesn't validate the X-Requested-With header on the burn-on-read reveal endpoint 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-2026-5769#Go/github.com/mattermost/mattermost-server/v5
- https://github.com/advisories/GHSA-xvcx-mgpc-5xh3
- https://nvd.nist.gov/vuln/detail/CVE-2026-6339
- https://github.com/mattermost/mattermost/commit/7a339a6438f5a4a5feba6b8de887f17a1378b207
- https://mattermost.com/security-updates
CVE-2026-6339 · published · modified · JSON