CVE-2026-6341 Details
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
A vulnerability exists in Mattermost Plugins versions 11.5, 11.1.5, 10.13.11, and 11.3.4.0, where API-level checks are insufficient regarding group permissions for issue creation and comment attachment. This flaw enables users who are members of multiple groups to direct API requests to create issues in locked groups. Mattermost Advisory ID: MMSA-2026-00602
Users can upgrade to Mattermost Plugins version 11.7.011.6.211.5.510.11.17 to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed May 18, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://mattermost.com/security-updates | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-863 | Incorrect Authorization | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| mattermost mattermost server | >= 10.13.0, <= 10.13.11 >= 11.1.0, <= 11.1.5 >= 11.3.0, <= 11.3.4 |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 29, 2026 | Initial Analysis | [email protected] |
| May 18, 2026 | New CVE Received | [email protected] |