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, 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.
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-9rfm-c5g6-538pExploitVendor Advisory
FAQ
What is CVE-2026-33406?
CVE-2026-33406 is a vulnerability with a CVSS score of 5.4 (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, configuration values from the /api/config endpoin...
How severe is CVE-2026-33406?
CVE-2026-33406 has been rated MEDIUM with a CVSS base score of 5.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-33406?
Check the references section above for vendor advisories and patch information. Affected products include: Pi-Hole Web Interface.