Vulnerability Description
Pi-hole Admin Interface is a web interface for managing Pi-hole, a network-level ad and internet tracker blocking application. From 6.0 to before 6.5, a reflected DOM-based XSS vulnerability in taillog.js allows an unauthenticated attacker to inject arbitrary HTML into the Pi-hole admin interface by crafting a malicious URL. The file query parameter is interpolated into an innerHTML assignment without escaping. Because the Content-Security-Policy is missing the form-action directive, injected <form> elements can exfiltrate credentials to an external origin. This vulnerability is fixed in 6.5.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Pi-Hole | Web Interface | >= 6.0, <= 6.4.1 |
Related Weaknesses (CWE)
References
- https://github.com/pi-hole/web/security/advisories/GHSA-7xqw-r9pr-qv59Vendor Advisory
- https://github.com/pi-hole/web/security/advisories/GHSA-7xqw-r9pr-qv59Vendor Advisory
FAQ
What is CVE-2026-33403?
CVE-2026-33403 is a vulnerability with a CVSS score of 6.1 (MEDIUM). Pi-hole Admin Interface is a web interface for managing Pi-hole, a network-level ad and internet tracker blocking application. From 6.0 to before 6.5, a reflected DOM-based XSS vulnerability in taillo...
How severe is CVE-2026-33403?
CVE-2026-33403 has been rated MEDIUM with a CVSS base score of 6.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-33403?
Check the references section above for vendor advisories and patch information. Affected products include: Pi-Hole Web Interface.