Python
CVE-2026-26953
MEDIUM
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
Lifecycle Timeline
4DescriptionGitHub Advisory
Pi-hole Admin Interface is a web interface for managing Pi-hole, a network-level ad and internet tracker blocking application. Versions 6.0 and above have a Stored HTML Injection vulnerability in the active sessions table located on the API settings page, allowing an attacker with valid credentials to inject arbitrary HTML code that will be rendered in the browser of any administrator who visits the active sessions page. The rowCallback function contains the value data.x_forwarded_for, which is directly concatenated into an HTML string and inserted into the DOM using jQuery’s .html() method. This method interprets the content as HTML, which means that any HTML tags present in the value will be parsed and rendered by the browser. An attacker can use common tools such as curl, wget, Python requests, Burp Suite, or even JavaScript fetch() to send an authentication request with an X-Forwarded-For header that contains malicious HTML code instead of a legitimate IP address. Since Pi-hole implements a Content Security Policy (CSP) that blocks inline JavaScript, the impact is limited to pure HTML injection without the ability to execute scripts. This issue has been fixed in version 6.4.1.
AnalysisAI
Stored HTML injection in Pi-hole Admin Interface versions 6.0+ allows authenticated attackers to inject arbitrary HTML into the active sessions table via the X-Forwarded-For header, which is unsafely rendered when administrators view the API settings page. Public exploit code exists for this vulnerability, affecting administrators who manage Pi-hole instances. An attacker with valid credentials can exploit this to perform client-side attacks against other administrators viewing the compromised session data.
Technical ContextAI
Classified as CWE-20 (Improper Input Validation). Affects the Interface is a web component of Web Interface. Pi-hole Admin Interface is a web interface for managing Pi-hole, a network-level ad and internet tracker blocking application. Versions 6.0 and above have a Stored HTML Injection vulnerability in the active sessions table located on the API settings page, allowing an attacker with valid credentials to inject arbitrary HTML code that will be rendered in the browser of any administrator who visits the active sessions page. The rowCallback function contains the value data.x_forwarded_for, which is
RemediationAI
A vendor patch is available — apply it immediately. Fixed in version 6.4.1.. Restrict network access to the affected service where possible.
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Same weakness CWE-20 – Improper Input Validation
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External POC / Exploit Code
Leaving vuln.today