CVE-2026-33405: Pi-hole has a Stored HTML Injection in queries.js

Severity: medium (CVSS 4.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% 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, 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 same fields are properly escaped in the table view (rowCallback), confirming the omission was an oversight. 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-jx8x-mj2r-62vq

Get alerted when CVE-2026-33405 or the next vulnerability affects your stack