Go/github.com/mattermost/mattermost-server CVE-2026-3590: medium 6.5, EPSS 0.15%
Mattermost has session spoofing due to lack of single-use consumption of guest magic link tokens enforcement in github.com/mattermost/mattermost-server
Action: Upgrade github.com/mattermost/mattermost-server to 10.11.13+incompatible or later.
go get github.com/mattermost/mattermost-server@v10.11.13+incompatiblego get github.com/mattermost/mattermost-server@v11.3.3+incompatiblego get github.com/mattermost/mattermost-server@v11.4.3+incompatiblego get github.com/mattermost/mattermost-server@v11.5.0+incompatibleAffected
| introduced | fixed | last affected |
|---|---|---|
| 10.11.0-rc1+incompatible | 10.11.13+incompatible | - |
| 11.3.0-rc1+incompatible | 11.3.3+incompatible | - |
| 11.4.0-rc1+incompatible | 11.4.3+incompatible | - |
| 11.5.0-rc1+incompatible | 11.5.0+incompatible | - |
Fixed versions
| 10.11.13+incompatible | 11.3.3+incompatible | 11.4.3+incompatible | 11.5.0+incompatible |
Sources
- osv: GO-2026-5507
- nvd: CVE-2026-3590
- https://github.com/advisories/GHSA-mh4x-rmrx-3hp4
- https://mattermost.com/security-updates
CVE-2026-3590 · published · modified · JSON