CVE-2025-27715

Auto-Enrollment of Team Admins into Private Channels without explicit consent

Description

Mattermost versions 9.11.x <= 9.11.8 fail to prompt for explicit approval before adding a team admin to a private channel, which team admins to joining private channels via crafted permalink links without explicit consent from them.

Remediation

Solution:

  • Update Mattermost to versions 10.5.0, 9.11.9 or higher.

Category

3.3
CVSS
Severity: Low
CVSS 3.1 •
EPSS 0.04%
Vendor Advisory mattermost.com
Affected: Mattermost Mattermost
Published at:
Updated at:

References

Link Tags
https://mattermost.com/security-updates vendor advisory

Frequently Asked Questions

What is the severity of CVE-2025-27715?
CVE-2025-27715 has been scored as a low severity vulnerability.
How to fix CVE-2025-27715?
To fix CVE-2025-27715: Update Mattermost to versions 10.5.0, 9.11.9 or higher.
Is CVE-2025-27715 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-27715 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-2025-27715?
CVE-2025-27715 affects Mattermost Mattermost.
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