CVE-2025-20088

Name of the Vulnerable Software and Affected Versions Mattermost versions 9.11.x through 9.11.5 Mattermost versions 10.0.x through 10.0.3 Mattermost versions 10.1.x through 10.1.3 Mattermost versions 10.2.x through 10.2.0

Description The issue is related to the improper validation of post properties, which allows a malicious authenticated user to cause a crash via a malicious post. This can be achieved through a public post, but specific details about the exploitation, such as API endpoints or vulnerable parameters, are not provided.

Recommendations For Mattermost versions 9.11.x through 9.11.5, update to a version later than 9.11.5 to resolve the issue. For Mattermost versions 10.0.x through 10.0.3, update to a version later than 10.0.3 to resolve the issue. For Mattermost versions 10.1.x through 10.1.3, update to a version later than 10.1.3 to resolve the issue. For Mattermost versions 10.2.x through 10.2.0, update to a version later than 10.2.0 to resolve the issue.