CVE-2025-27933

Unauthorized Private-to-Public Channel Conversion

Description

Mattermost versions 10.4.x <= 10.4.2, 10.3.x <= 10.3.3, 9.11.x <= 9.11.8 fail to fail to enforce channel conversion restrictions, which allows members with permission to convert public channels to private ones to also convert private ones to public

Remediation

Solution:

  • Update Mattermost to versions 10.5.0, 10.4.3, 10.3.4, 9.11.9 or higher.

Category

5.4
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.03%
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-2025-27933?
CVE-2025-27933 has been scored as a medium severity vulnerability.
How to fix CVE-2025-27933?
To fix CVE-2025-27933: Update Mattermost to versions 10.5.0, 10.4.3, 10.3.4, 9.11.9 or higher.
Is CVE-2025-27933 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-27933 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-2025-27933?
CVE-2025-27933 affects Mattermost Mattermost.
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