CVE-2026-8075

Name of the Vulnerable Software and Affected Versions Mattermost Desktop App versions 5.5.13 Mattermost Desktop App versions 6.0.2.0 Mattermost Desktop App versions prior to 6.3

Description The application fails to properly perform a null check when verifying headers. This allows a user to cause the application to crash for other channel members by posting a malicious link containing an embedded image that is missing one of the required headers.

Recommendations Update Mattermost Desktop App version 5.5.13 to a newer version. Update Mattermost Desktop App version 6.0.2.0 to a newer version. Update Mattermost Desktop App versions prior to 6.3 to a newer version.