CVE-2026-33406: Pi-hole Admin Interface is a web interface for managing Pi-hole, a network-level ad and internet tracker blocking…
CVE-2026-33406 · Severity: medium · CVSS 5.4 · 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, configuration values from the /api/config endpoint are placed directly into HTML value="" attributes without escaping in settings-advanced.js, enabling HTML attribute injection. A double quote in any config value breaks out of the attribute context. JavaScript execution is blocked by the server's CSP (script-src 'self'), but injected attributes can alter element styling for UI redressing. The primary attack vector is importing a malicious teleporter backup, which bypasses per-field server-side validation. This vulnerability is fixed in 6.5.
No. Junglewise Threat Intelligence has no report of CVE-2026-33406 being exploited in the wild.
How severe is CVE-2026-33406?
Medium severity, with a CVSS score of 5.4, 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-2026-33406?
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-2026-33406?
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.