CVE-2025-53533 Pi-hole Admin Interface vulnerable to cross-site scripting via malformed URL path on 404 error page
Attackers can execute arbitrary JavaScript in victims' browsers via reflected XSS in the Pi-hole Admin Interface 404 error page.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2025-53533?
CVE-2025-53533 is a medium-severity cross-site scripting vulnerability in pi-hole web, published on 27 Oct 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Pi-hole Admin Interface is a web interface for managing Pi-hole, a network-level advertisement and internet tracker blocking application. 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. An attacker can craft a URL containing an onload attribute that will execute arbitrary JavaScript code in the browser when a victim visits the malicious link. If an attacker sends a crafted pi-hole link to a victim and the victim visits it, attacker-controlled JavaScript code is executed in the browser of the victim. This has been patched in version 6.3.
Weakness: CWE-79
Which versions are affected by CVE-2025-53533?
It affects 1 product.
Products include Pi-Hole Web Interface.
How do I fix CVE-2025-53533?
No fix has been published for CVE-2025-53533 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2025-53533 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-53533 exists.
Public exploit code: 1 Nuclei template and 1 proofs of concept on GitHub.
Other vulnerabilities in pi-hole web
- CVE-2026-33765 Pi-hole Web Interface has a Command Injection Vulnerability
- CVE-2023-23614 Improper session handling of "Remember me for 7 days" functionality
- CVE-2025-59151 Pi-hole Admin Interface vulnerable to HTTP response header injection via CRLF injection
- CVE-2021-3706 Sensitive Cookie Without 'HttpOnly' Flag in pi-hole/adminlte
- CVE-2021-41175 Stored XSS in Client Groups Management (Authenticated)
Sources
Also known as GHSA-w8f8-92rx-4f6w.