pi-hole web up to 6.4 Admin Interface network.js cross site scripting

Summaryinfo

A vulnerability identified as problematic has been detected in pi-hole web up to 6.4. This vulnerability affects unknown code of the file network.js of the component Admin Interface. This manipulation causes cross site scripting. This vulnerability is tracked as CVE-2026-33404. The attack is restricted to local execution. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability has been found in pi-hole web up to 6.4 and classified as problematic. Affected by this vulnerability is some unknown functionality of the file network.js of the component Admin Interface. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

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, client hostnames and IP addresses from the FTL database are rendered into the DOM without escaping in network.js (Network page) and charts.js/index.js (Dashboard chart tooltips). While upstream validation in dnsmasq and FTL blocks HTML characters via normal DHCP/DNS paths, the web UI performs no output escaping — an inconsistency with other fields in the same file that are properly escaped. This vulnerability is fixed in 6.5.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-33404 since 03/19/2026. The exploitation appears to be easy. Attacking locally is a requirement. Additional levels of successful authentication are required for exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

Upgrading to version 6.5 eliminates this vulnerability.

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Productinfo

Vendor

• pi-hole

Name

• web

Version

• 6.0
• 6.1
• 6.2
• 6.3
• 6.4

Website

• Product: https://github.com/pi-hole/web/

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