CVE-2026-26230
Team Admin Privilege Escalation to Demote Members to Guest
- State
- Published
- Severity
- 3.8 Low
- Published
- Mar 16, 2026
- Updated
- Mar 17, 2026
- Reserved
- Feb 13, 2026
Description
Mattermost versions 10.11.x <= 10.11.10 fail to properly validate permission requirements in the team member roles API endpoint which allows team administrators to demote members to guest role. Mattermost Advisory ID: MMSA-2025-00531
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 3.8 Low | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N | Mattermost |
Weaknesses
- CWE-863 Incorrect Authorization
Affected Products
| Product | Versions |
|---|---|
MattermostMattermost |
|
References
- MMSA-2025-00531vendor-advisory
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