# CVE-2021-41175: Stored XSS in Client Groups Management (Authenticated)

> An authenticated attacker can inject malicious scripts via the client groups management page, potentially compromising user sessions.

- **Severity:** High 7.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 26 Oct 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-mhr8-7rvg-8r43

## What is CVE-2021-41175?

CVE-2021-41175 is a high-severity cross-site scripting vulnerability in pi-hole AdminLTE, published on 26 Oct 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

Pi-hole's Web interface (based on AdminLTE) provides a central location to manage one's Pi-hole and review the statistics generated by FTLDNS. Prior to version 5.8, cross-site scripting is possible when adding a client via the groups-clients management page. This issue was patched in version 5.8.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2021-41175?

It affects 1 product.


Products: Pi-Hole Web Interface.

## How do I fix CVE-2021-41175?

No fix has been published for CVE-2021-41175 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-41175 being exploited?

There is no known exploitation of CVE-2021-41175 in the wild and no public exploit code.

## Other vulnerabilities in pi-hole AdminLTE

- [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-2021-3811](https://insights.sbomify.com/CVE-2021-3811/): Cross-site Scripting (XSS) - Reflected in pi-hole/adminlte (medium 6.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-41175 and fix it if it is affected.

What it is: CVE-2021-41175 is a high-severity cross-site scripting vulnerability in pi-hole AdminLTE, published on 26 Oct 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-41175 in the wild and no public exploit code.

Affected product: pi-hole AdminLTE. 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-2021-41175/ (Markdown: https://insights.sbomify.com/CVE-2021-41175/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-41175
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-41175
- OSV: https://osv.dev/vulnerability/CVE-2021-41175

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-41175/
Summaries are generated and may contain mistakes; the official description above is the record.