Go/github.com/mattermost/mattermost-server CVE-2026-3590: medium 6.5, EPSS 0.23%
Mattermost has session spoofing due to lack of single-use consumption of guest magic link tokens enforcement
Action: Upgrade github.com/mattermost/mattermost-server to 10.11.13 or later.
go get github.com/mattermost/mattermost-server@v10.11.13go get github.com/mattermost/mattermost-server@v11.5.0go get github.com/mattermost/mattermost-server@v11.4.3go get github.com/mattermost/mattermost-server@v11.3.3Affected
| introduced | fixed | last affected |
|---|---|---|
| 10.11.0-rc1 | 10.11.13 | - |
| 11.5.0-rc1 | 11.5.0 | - |
| 11.4.0-rc1 | 11.4.3 | - |
| 11.3.0-rc1 | 11.3.3 | - |
Fixed versions
| 10.11.13 | 11.5.0 | 11.4.3 | 11.3.3 |
Sources
- osv: GHSA-mh4x-rmrx-3hp4#Go/github.com/mattermost/mattermost-server
- https://nvd.nist.gov/vuln/detail/CVE-2026-3590
- https://github.com/mattermost/mattermost
- https://mattermost.com/security-updates
CVE-2026-3590 · published · modified · JSON