Kirby CMS versions 5.3.0 through 5.4.0 are vulnerable to a path traversal vulnerability via the /api/auth/login endpoint. An unauthenticated attacker may supply a specially crafted email value in the request body containing traversal sequences (such as "../.."), which the application concatenates directly into a filesystem path when hydrating user objects. This can result in the resolution of paths outside the intended accounts directory and may lead to the inclusion of unintended files such as index.php, causing a denial of service by exhausting memory limits. The issue is addressed in version 5.4.1 by properly validating and sanitizing the user-supplied input to prevent directory traversal.
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