Go/github.com/mattermost/mattermost-server CVE-2026-6333: medium 5, EPSS 0.14%
Mattermost doesn't validate the Host header when constructing response URLs for custom slash command in github.com/mattermost/mattermost-server
Action: Upgrade github.com/mattermost/mattermost-server to 10.11.14+incompatible or later.
go get github.com/mattermost/mattermost-server@v10.11.14+incompatiblego get github.com/mattermost/mattermost-server@v11.5.2+incompatibleAffected
| introduced | fixed | last affected |
|---|---|---|
| 10.11.0+incompatible | 10.11.14+incompatible | - |
| 11.5.0+incompatible | 11.5.2+incompatible | - |
Fixed versions
| 10.11.14+incompatible | 11.5.2+incompatible |
Sources
- osv: GO-2026-5671
- nvd: CVE-2026-6333
- https://github.com/advisories/GHSA-vqp5-2mrp-qqxg
- https://github.com/mattermost/mattermost/commit/e738016c592045e14bf926eafaeda6f8521def6d
- https://mattermost.com/security-updates
CVE-2026-6333 · published · modified · JSON