Go/github.com/mattermost/mattermost-server CVE-2026-6333: low 3.5, EPSS 0.14%
Mattermost doesn't validate the Host header when constructing response URLs for custom slash command
Action: Upgrade github.com/mattermost/mattermost-server to 5.3.2-0.20260325160634-e738016c5920 or later.
go get github.com/mattermost/mattermost-server@v5.3.2-0.20260325160634-e738016c5920Affected
| introduced | fixed | last affected |
|---|---|---|
| 0 | 5.3.2-0.20260325160634-e738016c5920 | - |
Fixed versions
| 5.3.2-0.20260325160634-e738016c5920 |
Sources
- osv: GHSA-vqp5-2mrp-qqxg#Go/github.com/mattermost/mattermost-server
- https://nvd.nist.gov/vuln/detail/CVE-2026-6333
- https://github.com/mattermost/mattermost/commit/e738016c592045e14bf926eafaeda6f8521def6d
- https://github.com/mattermost/mattermost
- https://mattermost.com/security-updates
CVE-2026-6333 · published · modified · JSON