CVE-2025-4128

Mattermost Guest User Information Disclosure Vulnerability

Description

Mattermost versions 10.5.x <= 10.5.4, 9.11.x <= 9.11.13 fail to properly restrict API access to team information, allowing guest users to bypass permissions and view information about public teams they are not members of via a direct API call to /api/v4/teams/{team_id}.

Remediation

Solution:

  • Update Mattermost to versions 10.8.0, 10.5.5, 9.11.14 or higher.

Category

3.1
CVSS
Severity: Low
CVSS 3.1 •
EPSS 0.02%
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-2025-4128?
CVE-2025-4128 has been scored as a low severity vulnerability.
How to fix CVE-2025-4128?
To fix CVE-2025-4128: Update Mattermost to versions 10.8.0, 10.5.5, 9.11.14 or higher.
Is CVE-2025-4128 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-4128 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-2025-4128?
CVE-2025-4128 affects Mattermost Mattermost.
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