CVE-2026-33403: Pi-hole Admin Interface is a web interface for managing Pi-hole, a network-level ad and internet tracker blocking…
CVE-2026-33403 · Severity: medium · CVSS 6.1 · Published 2026-04-06
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.
No. Junglewise Threat Intelligence has no report of CVE-2026-33403 being exploited in the wild.
How severe is CVE-2026-33403?
Medium severity, with a CVSS score of 6.1, published 6 April 2026.
Which products and versions are affected?
Pi-hole Web Interface. The advisory does not name versions.
Is there a fix for CVE-2026-33403?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
Am I affected by CVE-2026-33403?
Check whether you run Pi-hole Web Interface. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.