Medium severity6.5NVD Advisory· Published Apr 15, 2026· Updated Apr 22, 2026
CVE-2026-3590
CVE-2026-3590
Description
Mattermost versions 10.11.x <= 10.11.12, 11.5.x <= 11.5.0, 11.4.x <= 11.4.2, 11.3.x <= 11.3.2 fail to enforce atomic single-use consumption of guest magic link tokens, which allows an attacker with access to a valid magic link to establish multiple independent authenticated sessions via concurrent requests.. Mattermost Advisory ID: MMSA-2026-00624
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/mattermost/mattermost/server/v8Go | >= 8.0.0-20250721062209-4952acea88ce, < 8.0.0-20250723052842-4cb8d8940332 | 8.0.0-20250723052842-4cb8d8940332 |
github.com/mattermost/mattermost-serverGo | >= 10.11.0-rc1, < 10.11.13 | 10.11.13 |
github.com/mattermost/mattermost-serverGo | >= 11.5.0-rc1, < 11.5.0 | 11.5.0 |
github.com/mattermost/mattermost-serverGo | >= 11.4.0-rc1, < 11.4.3 | 11.4.3 |
github.com/mattermost/mattermost-serverGo | >= 11.3.0-rc1, < 11.3.3 | 11.3.3 |
Affected products
1- cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*Range: >=10.11.0,<10.11.13
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
3- github.com/advisories/GHSA-mh4x-rmrx-3hp4ghsaADVISORY
- mattermost.com/security-updatesnvdVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-3590ghsaADVISORY
News mentions
0No linked articles in our index yet.