---
title: "CVE-2026-45140: Chamilo LMS CStudio upload flow allows unauthenticated remote code execution"
url: https://erroneo.us/security/cve/CVE-2026-45140/
description: "CVE-2026-45140 (chamilo/chamilo-lms (Composer (PHP))): Chamilo LMS is an open-source learning management system. Prior to 2.0.1, Chamilo LMS allows an…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-09-17
date_modified: 2026-09-18
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-45140"
kev: false
cvss: 9.8
epss: 0.01326
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-45140: Chamilo LMS CStudio upload flow allows unauthenticated remote code execution

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 1.3% , percentile 71: FIRST’s model estimates a 1.3% chance of exploitation activity in the next 30 days, higher than 71% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes chamilo/chamilo-lms (Composer (PHP)) <= 2.0.0, fixed in 2.0.1 . Check your lockfile, including transitive dependencies.

## What it is

Chamilo LMS is an open-source learning management system. Prior to 2.0.1, Chamilo LMS allows an unauthenticated remote attacker to execute arbitrary code on the server. The authoritative advisory does not identify the affected endpoint, component, input, or exploitation mechanism. This issue is fixed in version 2.0.1.

## Affected packages

- Composer (PHP) `chamilo/chamilo-lms` <= 2.0.0 → fixed: 2.0.1

## Affected products (CVE record)

- chamilo chamilo-lms: < 2.0.1

## Severity

- GitHub_M CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
- GitHub CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 1.33% probability of exploitation activity in the next 30 days; percentile 71.

## Sources

- [GitHub Advisory GHSA-g4c3-4g96-6g4m](https://github.com/advisories/GHSA-g4c3-4g96-6g4m)
- [CVE.org record CVE-2026-45140](https://www.cve.org/CVERecord?id=CVE-2026-45140)
- [NVD entry CVE-2026-45140](https://nvd.nist.gov/vuln/detail/CVE-2026-45140)
- [github.com](https://github.com/chamilo/chamilo-lms/security/advisories/GHSA-g4c3-4g96-6g4m)
- [github.com](https://github.com/chamilo/chamilo-lms/commit/4bdba1b9a8820bd70c0809317775d7f6eaa79844)
- [github.com](https://github.com/chamilo/chamilo-lms/releases/tag/v2.0.1)

---
Source page: https://erroneo.us/security/cve/CVE-2026-45140/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt