GHSA-FVWQ-45QV-XVHV CraftCMS vulnerable to reflective XSS via incomplete return URL sanitization

Summary The fix for CVE-2025-35939 in craftcms/cms introduced a striptags call in src/web/User.php to sanitize return URLs before they are stored in the session. However, striptags only removes HTML tags angle brackets -- it does not inspect or filter URL schemes. Payloads like...

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...