CVE-2025-27571

Channel metadata visible in archived channels despite configuration setting

Description

Mattermost versions 10.5.x <= 10.5.1, 10.4.x <= 10.4.3, 9.11.x <= 9.11.9 fail to check the "Allow Users to View Archived Channels" configuration when fetching channel metadata of a post from archived channels, which allows authenticated users to access such information when a channel is archived.

Remediation

Solution:

  • Update Mattermost to versions 10.6.0, 10.5.2, 10.4.4, 9.11.10 or higher.

Category

4.3
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.03%
Affected: Mattermost Mattermost
Published at:
Updated at:

References

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

Frequently Asked Questions

What is the severity of CVE-2025-27571?
CVE-2025-27571 has been scored as a medium severity vulnerability.
How to fix CVE-2025-27571?
To fix CVE-2025-27571: Update Mattermost to versions 10.6.0, 10.5.2, 10.4.4, 9.11.10 or higher.
Is CVE-2025-27571 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-27571 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-2025-27571?
CVE-2025-27571 affects Mattermost Mattermost.
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