CVE-2025-59151
HighCVSS 8.2Exploitation Probability (EPSS)
Low risk36th percentile - higher than 36% of all known CVEs
Summary
Pi-hole Admin Interface before version 6.3 is vulnerable to CRLF injection. When a request is made to a file ending with the .lp extension, the application performs a redirect without proper input sanitization. An attacker can inject carriage return and line feed characters (%0d%0a) to manipulate both headers and content of the HTTP response, enabling injection of arbitrary HTTP response headers, potentially leading to session fixation, cache poisoning, and weakening or bypassing browser-based security mechanisms such as CSP or X-XSS-Protection.
Risk Assessment
An attacker can hijack user sessions, poison browser caches, and weaken XSS protections, threatening the security of the entire Pi-hole infrastructure.
Recommendation
Immediately update Pi-hole Admin Interface to version 6.3 or later, which includes a fix for the CRLF injection vulnerability.
Other vulnerabilities in Pi-hole Admin Interface
See all- CVE-2026-33405Low
In the Pi-hole Admin Interface, the formatInfo() function in queries.js renders data.upstream, data.client.ip, and data.ede.text into HTML without escaping when a user expands a query row in the Query Log, enabling stored HTML injection. JavaScript execution is blocked by the server's CSP (script-src 'self'). The vulnerability is fixed in 6.5.
- CVE-2026-33406Medium
Pi-hole Admin Interface from 6.0 to before 6.5 places configuration values from the /api/config endpoint 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.
- CVE-2026-33404Low
In the Pi-hole Admin Interface, client hostnames and IP addresses from the FTL database are rendered into the DOM without escaping in network.js and charts.js/index.js. Although upstream validation in dnsmasq and FTL blocks HTML characters via normal DHCP/DNS paths, the web UI performs no output escaping, inconsistent with other fields. The vulnerability is fixed in 6.5.
- CVE-2026-33403Medium
Pi-hole Admin Interface versions 6.0 to before 6.5 contain a reflected DOM-based XSS vulnerability in taillog.js. An unauthenticated attacker can inject arbitrary HTML into the admin interface via a crafted URL because the file parameter is interpolated into innerHTML without escaping. The missing form-action directive in Content-Security-Policy allows injected forms to exfiltrate credentials. The vulnerability is fixed in 6.5.
- CVE-2025-53533Medium
Pi-hole Admin Interface versions 6.2.1 and earlier are vulnerable to reflected cross-site scripting (XSS) via a malformed URL path. The 404 error page includes the requested path in the class attribute of the body tag without proper sanitization or escaping.
- CVE-2025-32785Medium
Pi-hole Admin Interface versions prior to 6.3 are vulnerable to cross-site scripting (XSS) via the Address field in the Subscribed Lists group management section. An authenticated user can inject malicious JavaScript that executes when another user navigates to the Tools section and performs a gravity database update. The vulnerability is patched in version 6.3.
Original NVD description (English source)
Pi-hole Admin Interface is a web interface for managing Pi-hole, a network-level advertisement and internet tracker blocking application. Pi-hole Admin Interface before 6.3 is vulnerable to Carriage Return Line Feed (CRLF) injection. When a request is made to a file ending with the .lp extension, the application performs a redirect without properly sanitizing the input. An attacker can inject carriage return and line feed characters (%0d%0a) to manipulate both the headers and the content of the HTTP response. This enables the injection of arbitrary HTTP response headers, potentially leading to session fixation, cache poisoning, and the weakening or bypassing of browser-based security mechanisms such as Content Security Policy or X-XSS-Protection. This vulnerability is fixed in 6.3.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS