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

Low 3.1 Published 6 Apr 2026 Updated 6 Apr 2026

Attackers can inject HTML into Pi-hole query logs, bypassing CSP restrictions to potentially alter UI or execute limited actions.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Local or same network only
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2026-33405?

CVE-2026-33405 is a low-severity cross-site scripting vulnerability in pi-hole web, published on 6 Apr 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official 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.

Weakness: CWE-79

Which versions are affected by CVE-2026-33405?

It affects 1 product.

Products include Pi-Hole Web Interface.

How do I fix CVE-2026-33405?

No fix has been published for CVE-2026-33405 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2026-33405 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-33405 exists.

Sources

Also known as GHSA-jx8x-mj2r-62vq.