CVE-2026-26952 Pi-hole Web Interface has Stored HTML Injection via Local DNS Records (CNAME/Hosts) in data-tag Attribute
Authenticated administrators can inject HTML into DNS records, bypassing CSP restrictions to potentially alter page rendering or behavior.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-26952?
CVE-2026-26952 is a medium-severity cross-site scripting vulnerability in pi-hole web, published on 19 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.
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.
Which versions are affected by CVE-2026-26952?
It affects 1 product.
Products include Pi-Hole Web Interface.
How do I fix CVE-2026-26952?
Upgrade to a fixed version.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-26952 being exploited?
There is no known exploitation of CVE-2026-26952 in the wild and no public exploit code.
Other vulnerabilities in pi-hole web
- CVE-2026-33765 Pi-hole Web Interface has a Command Injection Vulnerability
- CVE-2023-23614 Improper session handling of "Remember me for 7 days" functionality
- CVE-2025-59151 Pi-hole Admin Interface vulnerable to HTTP response header injection via CRLF injection
- CVE-2021-3706 Sensitive Cookie Without 'HttpOnly' Flag in pi-hole/adminlte
- CVE-2021-41175 Stored XSS in Client Groups Management (Authenticated)
Sources
Also known as GHSA-6xp4-jw73-f4qp.