Craft CMS Other Vulnerability - CVE-2025-35939

Craft CMS stores arbitrary content provided by unauthenticated users in session files. This content could be accessed and executed possibly using an independent vulnerability. Craft CMS redirects requests that require authentication to the login page and generates a session file on the server at 39/var/lib/php/sessions39. Such session files are named 39sess_session_value39 where 39session_value39 is provided to the client in a 39Set-Cookie39 response header. Craft CMS stores the return URL requested by the client without sanitizing parameters. Consequently an unauthenticated client can introduce arbitrary values such as PHP code to a known local file location on the server. Craft CMS versions 5.7.5 and 4.15.3 have been released to address this issue.