What’s Vulnerable › Vulnerabilities
CVE-2026-6341: Incomplete group locking implementation
- Severity: medium (CVSS 4.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-05-18 · updated 2026-10-14
- Weakness: CWE-863
Description
Mattermost Plugins versions <=11.5 11.1.5 10.13.11 11.3.4.0 fail to have API-level checks on which groups the user can create issues or attach comments to which allows a user that is member of multiple groups to create issues to a locked group via direct API requests. Mattermost Advisory ID: MMSA-2026-00602
Affected products
- Mattermost: from 10.13.0 through 10.13.11; from 11.1.0 through 11.1.5; from 11.3.0 through 11.3.4
References
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