CVE-2026-33403: Pi-hole Web Interface

Medium severity, CVSS 6.1. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Pi-hole Web Interface: from 6.0, up to and including 6.4.1

Published 2026-04-06. Last modified 2026-06-17.