A vulnerability was found in perfree go-fastdfs-web up to 1.3.7 and classified as critical . Affected is the function checkServer of the file /install/checkServer of the component Installation Endpoint . Executing a manipulation can lead to server-side request forgery. This vulnerability is handled as CVE-2026-11437 . The attack can be executed remotely. Additionally, an exploit exists. The vendor was contacted early about this disclosure but did not respond in any way.