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

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

- **Severity:** Low 3.1 (`CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N`)
- **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 available:** No
- **Published:** 6 Apr 2026
- **Updated:** 6 Apr 2026
- **Also known as:** GHSA-jx8x-mj2r-62vq

## 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 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-33405?

It affects 1 product.


Products: 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.

## Is CVE-2026-33405 being exploited?

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

## Other vulnerabilities in pi-hole web

- [CVE-2026-33765](https://insights.sbomify.com/CVE-2026-33765/): Pi-hole Web Interface has a Command Injection Vulnerability (high 8.9)
- [CVE-2023-23614](https://insights.sbomify.com/CVE-2023-23614/): Improper session handling of "Remember me for 7 days" functionality (high 8.8)
- [CVE-2025-59151](https://insights.sbomify.com/CVE-2025-59151/): Pi-hole Admin Interface vulnerable to HTTP response header injection via CRLF injection (high 8.2)
- [CVE-2021-3706](https://insights.sbomify.com/CVE-2021-3706/): Sensitive Cookie Without 'HttpOnly' Flag in pi-hole/adminlte (high 7.4)
- [CVE-2021-41175](https://insights.sbomify.com/CVE-2021-41175/): Stored XSS in Client Groups Management (Authenticated) (high 7.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-33405 and fix it if it is affected.

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

Affected product: pi-hole web. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-33405/ (Markdown: https://insights.sbomify.com/CVE-2026-33405/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-33405
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-33405
- OSV: https://osv.dev/vulnerability/CVE-2026-33405

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-33405/
Summaries are generated and may contain mistakes; the official description above is the record.