# CVE-2026-33698: Chamilo LMS affected by unauthenticated RCE in main/install folder

> Unauthenticated attackers can execute PHP code and modify files in Chamilo LMS if the install directory is accessible.

- **Severity:** Critical 9.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/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:** 10 Apr 2026
- **Updated:** 15 Apr 2026
- **Also known as:** GHSA-557g-2w66-gpmf

## What is CVE-2026-33698?

CVE-2026-33698 is a critical code injection vulnerability in Chamilo Chamilo Lms, published on 10 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Chamilo LMS is a learning management system. Prior to 1.11.38, a chained attack can enable otherwise-blocked PHP code from the main/install/ directory and allow an unauthenticated attacker to modify existing files or create new files where allowed by system permissions. This only affects portals with the main/install/ directory still present and read-accessible. This vulnerability is fixed in 1.11.38.

Weakness: CWE-552 (Files or Directories Accessible to External Parties)

## Which versions are affected by CVE-2026-33698?

It affects 1 product.


Products: Chamilo Chamilo Lms.

## How do I fix CVE-2026-33698?

No fix has been published for CVE-2026-33698 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-33698 being exploited?

There is no known exploitation of CVE-2026-33698 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-2026-33698 and fix it if it is affected.

What it is: CVE-2026-33698 is a critical code injection vulnerability in Chamilo Chamilo Lms, published on 10 Apr 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-2026-33698 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-2026-33698/ (Markdown: https://insights.sbomify.com/CVE-2026-33698/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-33698
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-33698
- OSV: https://osv.dev/vulnerability/CVE-2026-33698

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-33698/
Summaries are generated and may contain mistakes; the official description above is the record.