Go/github.com/mattermost/mattermost/server/v8 CVE-2026-21386: medium 4.3, EPSS 0.19%
Mattermost fails to use consistent error responses when handling the /mute command
Action: Upgrade github.com/mattermost/mattermost/server/v8 to 8.0.0-20260130144323-5bb5261c72fa or later.
go get github.com/mattermost/mattermost/server/v8@v8.0.0-20260130144323-5bb5261c72faAffected
| introduced | fixed | last affected |
|---|---|---|
| 0 | 8.0.0-20260130144323-5bb5261c72fa | - |
Fixed versions
| 8.0.0-20260130144323-5bb5261c72fa |
Sources
- osv: GHSA-5mr9-crcg-8wh2
- https://nvd.nist.gov/vuln/detail/CVE-2026-21386
- https://github.com/mattermost/mattermost/commit/5bb5261c72faa476558a694c23581d24b734da41
- https://github.com/mattermost/mattermost
- https://mattermost.com/security-updates
CVE-2026-21386 · published · modified · JSON