# CVE-2025-52564: Chamilo: HTML injection via open parameter

> Attackers can inject arbitrary HTML into Chamilo LMS via the open parameter in help.php, potentially leading to script execution.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/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:** Not needed
- **Fix available:** No
- **Published:** 2 Mar 2026
- **Updated:** 2 Mar 2026
- **Also known as:** GHSA-6fmm-qrx4-wgqc

## What is CVE-2025-52564?

CVE-2025-52564 is a medium-severity cross-site scripting vulnerability in Chamilo Chamilo Lms, published on 2 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Chamilo is a learning management system. Prior to version 1.11.30, the open parameter of help.php fails to properly sanitize user input. This allows an attacker to inject arbitrary HTML, such as underlined text, via a crafted URL. This issue has been patched in version 1.11.30.

Weakness: CWE-80 (Improper Neutralization of Script-Related HTML Tags in a Web Page)

## Which versions are affected by CVE-2025-52564?

It affects 1 product.


Products: Chamilo Chamilo Lms.

## How do I fix CVE-2025-52564?

No fix has been published for CVE-2025-52564 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-52564 being exploited?

There is no known exploitation of CVE-2025-52564 in the wild and no public exploit code.

## Other vulnerabilities in Chamilo Chamilo Lms

- [CVE-2025-50187](https://insights.sbomify.com/CVE-2025-50187/): Chamilo: Evaluation of untrusted user input leads to Remote Code Execution (critical 9.8)
- [CVE-2023-34944](https://insights.sbomify.com/CVE-2023-34944/): File upload in n/a (critical 9.8)
- [CVE-2022-27423](https://insights.sbomify.com/CVE-2022-27423/): SQL injection in n/a (critical 9.8)
- [CVE-2021-35414](https://insights.sbomify.com/CVE-2021-35414/): SQL injection in n/a (critical 9.8)
- [CVE-2019-13082](https://insights.sbomify.com/CVE-2019-13082/): File upload in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-52564 and fix it if it is affected.

What it is: CVE-2025-52564 is a medium-severity cross-site scripting vulnerability in Chamilo Chamilo Lms, published on 2 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-52564 in the wild and no public exploit code.

Affected product: Chamilo Chamilo Lms. 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-2025-52564/ (Markdown: https://insights.sbomify.com/CVE-2025-52564/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-52564
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-52564
- OSV: https://osv.dev/vulnerability/CVE-2025-52564

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-52564/
Summaries are generated and may contain mistakes; the official description above is the record.