# CVE-2025-3531: YouDianCMS index.html cross site scripting

> Remote attackers can inject malicious scripts via UserName or LogType parameters in YouDianCMS admin logs, potentially compromising user sessions.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/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:** 13 Apr 2025
- **Updated:** 14 Apr 2025
- **Also known as:** GHSA-6whm-6hpx-vjhj

## What is CVE-2025-3531?

CVE-2025-3531 is a medium-severity cross-site scripting vulnerability in YouDianCMS, published on 13 Apr 2025. 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

A vulnerability classified as problematic has been found in YouDianCMS 9.5.21. This affects an unknown part of the file /App/Tpl/Admin/Default/Log/index.html. The manipulation of the argument UserName/LogType leads to cross site scripting. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-94 (Improper Control of Generation of Code), CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2025-3531?

It affects 1 product.


Products: Youdiancms Youdiancms.

## How do I fix CVE-2025-3531?

No fix has been published for CVE-2025-3531 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-3531 being exploited?

There is no known exploitation of CVE-2025-3531 in the wild and no public exploit code.

## Other vulnerabilities in YouDianCMS

- [CVE-2024-57052](https://insights.sbomify.com/CVE-2024-57052/): Auth bypass in n/a (critical 9.8)
- [CVE-2022-32301](https://insights.sbomify.com/CVE-2022-32301/): SQL injection in n/a (critical 9.8)
- [CVE-2022-32299](https://insights.sbomify.com/CVE-2022-32299/): SQL injection in n/a (high 8.8)
- [CVE-2022-32300](https://insights.sbomify.com/CVE-2022-32300/): SQL injection in n/a (high 8.8)
- [CVE-2020-18116](https://insights.sbomify.com/CVE-2020-18116/): SQL injection in n/a (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-3531 and fix it if it is affected.

What it is: CVE-2025-3531 is a medium-severity cross-site scripting vulnerability in YouDianCMS, published on 13 Apr 2025. 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-2025-3531 in the wild and no public exploit code.

Affected product: YouDianCMS. 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-2025-3531/ (Markdown: https://insights.sbomify.com/CVE-2025-3531/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-3531
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-3531
- OSV: https://osv.dev/vulnerability/CVE-2025-3531

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-3531/
Summaries are generated and may contain mistakes; the official description above is the record.