A vulnerability, which was classified as problematic , has been found in Mattermost up to 10.11.13/11.4.3/11.5.1/11.5.x . Affected by this vulnerability is an unknown functionality of the component SVG File Handler . This manipulation causes improper check for unusual conditions. The identification of this vulnerability is CVE-2026-4054 . It is possible to initiate the attack remotely. There is no exploit available. It is advisable to upgrade the affected component.