# CVE-2025-41356: Reflected Cross-Site Scripting in Anon Proxy Server

> Reflected XSS in Anon Proxy Server allows attackers to execute JavaScript via malicious URLs, potentially stealing session cookies or performing actions on behalf of users.

- **Severity:** Medium 5.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 31 Mar 2026
- **Updated:** 31 Mar 2026
- **Also known as:** GHSA-f28w-75x8-62f8

## What is CVE-2025-41356?

CVE-2025-41356 is a medium-severity cross-site scripting vulnerability in Anon Proxy Server, published on 31 Mar 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Reflected Cross-Site Scripting (XSS) vulnerability in Anon Proxy Server v0.104. This vulnerability allows an attacker to execute JavaScript code in the victim's browser by sending him/her a malicious URL. This vulnerability can be exploited to steal sensitive user data, such as session cookies, or to perform actions on behalf of the user. It affects 
'host' parameter in '/diagconnect.php'

 endpoint.

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

## Which versions are affected by CVE-2025-41356?

It affects 1 product.


Products: Anonproxyserver Anon Proxy Server.

## How do I fix CVE-2025-41356?

No fix has been published for CVE-2025-41356 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-41356 being exploited?

There is no known exploitation of CVE-2025-41356 in the wild and no public exploit code.

## Other vulnerabilities in Anon Proxy Server

- [CVE-2025-41355](https://insights.sbomify.com/CVE-2025-41355/): Reflected Cross-Site Scripting on Anon Proxy Server (medium 5.1)
- [CVE-2025-41357](https://insights.sbomify.com/CVE-2025-41357/): Reflected Cross-Site Scripting on Anon Proxy Server (medium 5.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-41356 and fix it if it is affected.

What it is: CVE-2025-41356 is a medium-severity cross-site scripting vulnerability in Anon Proxy Server, published on 31 Mar 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2025-41356 in the wild and no public exploit code.

Affected product: Anon Proxy Server. 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-2025-41356/ (Markdown: https://insights.sbomify.com/CVE-2025-41356/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-41356
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-41356
- OSV: https://osv.dev/vulnerability/CVE-2025-41356

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-41356/
Summaries are generated and may contain mistakes; the official description above is the record.