Vulnerability · Published Feb 19, 2026 · Assigned by GitHub_M
CVE-2026-26952Pi-hole Web Interface has Stored HTML Injection via Local DNS Records (CNAME/Hosts) in data-tag Attribute
Medium 5.4
In plain English
A medium-severity improper input validation in web from pi-hole. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 20% of all known vulnerabilities).
Official description
Pi-hole Admin Interface is a web interface for managing Pi-hole, a network-level ad and internet tracker blocking application. Versions 6.4 and below are vulnerable to stored HTML injection through the local DNS records configuration page, which allows an authenticated administrator to inject code that is stored in the Pi-hole configuration and rendered every time the DNS records table is viewed. The populateDataTable() function contains a data variable with the full DNS record value exactly as entered by the user and returned by the API. This value is inserted directly into the data-tag HTML attribute without any escaping or sanitization of special characters. When an attacker supplies a value containing double quotes ("), they can prematurely “close” the data-tag attribute and inject additional HTML attributes into the element. Since Pi-hole implements a Content Security Policy (CSP) that blocks inline JavaScript, the impact is limited. This issue has been fixed in version 6.4.1.
Affected products (as reported)
Weakness: CWE-20, CWE-79, CWE-116 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
References
- https://github.com/pi-hole/web/security/advisories/GHSA-6xp4-jw73-f4qp x_refsource_CONFIRM
- https://github.com/pi-hole/web/commit/d328f143718022d82dc94c8751121ca41be3b996 x_refsource_MISC
- https://github.com/pi-hole/web/releases/tag/v6.4.1 x_refsource_MISC