Pi-hole Admin Interface vulnerabilities

Pi-hole Admin Interface before version 6.3 is vulnerable to CRLF injection. When a request is made to a file ending with the .lp extension, the application performs a redirect without proper input sanitization. An attacker can inject carriage return and line feed characters (%0d%0a) to manipulate both headers and content of the HTTP response, enabling injection of arbitrary HTTP response headers, potentially leading to session fixation, cache poisoning, and weakening or bypassing browser-based security mechanisms such as CSP or X-XSS-Protection.

Pi-hole Admin Interface versions 6.2.1 and earlier are vulnerable to reflected cross-site scripting (XSS) via a malformed URL path. The 404 error page includes the requested path in the class attribute of the body tag without proper sanitization or escaping.

Pi-hole Admin Interface versions prior to 6.3 are vulnerable to cross-site scripting (XSS) via the Address field in the Subscribed Lists group management section. An authenticated user can inject malicious JavaScript that executes when another user navigates to the Tools section and performs a gravity database update. The vulnerability is patched in version 6.3.