CVE-2025-53971

Channel and Team Membership APIs inadvertently allow loss of Member privileges.

Description

Mattermost versions 10.5.x <= 10.5.8, 9.11.x <= 9.11.17 fail to properly validate authorization for team scheme role modifications which allows Team Admins to demote Team Members to Guests via the PUT /api/v4/teams/team-id/members/user-id/schemeRoles API endpoint.

Remediation

Solution:

  • Update Mattermost to versions 10.10.0, 10.5.9, 9.11.18 or higher.

Category

3.8
CVSS
Severity: Low
CVSS 3.1 •
EPSS 0.02%
Affected: Mattermost Mattermost
Published at:
Updated at:

References

Frequently Asked Questions

What is the severity of CVE-2025-53971?
CVE-2025-53971 has been scored as a low severity vulnerability.
How to fix CVE-2025-53971?
To fix CVE-2025-53971: Update Mattermost to versions 10.10.0, 10.5.9, 9.11.18 or higher.
Is CVE-2025-53971 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-53971 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-53971?
CVE-2025-53971 affects Mattermost Mattermost.
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