CVE-2026-33406 — Pi-hole has a Stored HTML attribute injection

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
pi-hole / web	affected >= 6.0, < 6.5

CWE

CWE-79

References

https://github.com/pi-hole/web/security/advisories/GHSA-9rfm-c5g6-538p

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.