# CVE-2018-1999019: Deserialization in n/a

> Unauthenticated attackers can achieve remote code execution via unsafe deserialization in the Chamilo LMS API endpoint.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 23 Jul 2018
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-g5qj-4p4v-2jhc

## What is CVE-2018-1999019?

CVE-2018-1999019 is a critical unsafe deserialization vulnerability in Chamilo Chamilo Lms, published on 23 Jul 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Chamilo LMS version 11.x contains an Unserialization vulnerability in the "hash" GET parameter for the api endpoint located at /webservices/api/v2.php that can result in Unauthenticated remote code execution. This attack appear to be exploitable via a simple GET request to the api endpoint. This vulnerability appears to have been fixed in After commit 0de84700648f098c1fbf6b807dee28ec640efe62.

Weakness: CWE-94 (Improper Control of Generation of Code)

## Which versions are affected by CVE-2018-1999019?

It affects 1 product.


Products: Chamilo Chamilo Lms.

## How do I fix CVE-2018-1999019?

No fix has been published for CVE-2018-1999019 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-1999019 being exploited?

There is no known exploitation of CVE-2018-1999019 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-2018-1999019 and fix it if it is affected.

What it is: CVE-2018-1999019 is a critical unsafe deserialization vulnerability in Chamilo Chamilo Lms, published on 23 Jul 2018. 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-2018-1999019 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-2018-1999019/ (Markdown: https://insights.sbomify.com/CVE-2018-1999019/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-1999019
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-1999019
- OSV: https://osv.dev/vulnerability/CVE-2018-1999019

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-1999019/
Summaries are generated and may contain mistakes; the official description above is the record.