CVE-2026-33404: Pi-hole has a Stored XSS / HTML injection in the Network page/Dashboard

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-04-06 · updated 2026-10-26
Weakness: CWE-79

Description

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.

Affected products

pi-hole web: from 6.0 through 6.4.1

References

https://github.com/pi-hole/web/security/advisories/GHSA-px6w-85wp-ww9v

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