Bug 2448235 (CVE-2026-26230) - CVE-2026-26230 github.com/mattermost/mattermost-server: Team Admin Privilege Escalation to Demote Members to Guest
Summary: CVE-2026-26230 github.com/mattermost/mattermost-server: Team Admin Privilege ...
Keywords:
Status: NEW
Alias: CVE-2026-26230
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2448250 2448251
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-03-16 21:02 UTC by OSIDB Bzimport
Modified: 2026-03-16 22:17 UTC (History)
0 users

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Description OSIDB Bzimport 2026-03-16 21:02:05 UTC 
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
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