Go/github.com/mattermost/mattermost-server CVE-2026-6339: unknown
Mattermost doesn't validate the X-Requested-With header on the burn-on-read reveal endpoint in github.com/mattermost/mattermost-server
Action: Upgrade github.com/mattermost/mattermost-server to 11.4.4+incompatible or later.
go get github.com/mattermost/mattermost-server@v11.4.4+incompatiblego get github.com/mattermost/mattermost-server@v11.5.2+incompatibleAffected
| introduced | fixed | last affected |
|---|---|---|
| 11.4.0+incompatible | 11.4.4+incompatible | - |
| 11.5.0+incompatible | 11.5.2+incompatible | - |
Fixed versions
| 11.4.4+incompatible | 11.5.2+incompatible |
Sources
- osv: GO-2026-5769
- 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