Security Digest · Vulnerability record
CVE-2026-45140: Chamilo LMS CStudio upload flow allows unauthenticated remote code execution
Chamilo LMS is an open-source learning management system.
CVSS 9.8 Critical EPSS 1.3% · p71
Should you act?
Critical and remotely reachable
No known exploitation yet, but it is network-reachable without credentials. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.
- 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.
From the GitHub advisory
Impact Ability to run arbitrary code on the server without authentication.
Weakness type: CWE-22, CWE-94, CWE-219, CWE-434.
Product: chamilo/chamilo-lms (Composer (PHP)) · Assigned by: GitHub_M · Published: 2026-09-17
Affected and fixed versions
| Ecosystem | Package | Vulnerable | First fixed |
|---|---|---|---|
| Composer (PHP) | chamilo/chamilo-lms | <= 2.0.0 | 2.0.1 |
| Vendor | Product | Affected versions (per CVE record) |
|---|---|---|
| chamilo | chamilo-lms | < 2.0.1 |
Severity scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_M | 3.1 | 9.8 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| GitHub | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- Attack vector: network (remotely reachable)
- Attack complexity: low
- Privileges required: none (no login)
- User interaction: none
- Scope: unchanged
CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.
Exploitation and urgency
- 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.
Timeline
- — CVE record published by GitHub_M
- — GitHub-reviewed advisory GHSA-g4c3-4g96-6g4m published (critical)
- — CVE record last updated
Sources and references
Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.
Vulnerability records
- GitHub Advisory GHSA-g4c3-4g96-6g4m github.com
- CVE.org record CVE-2026-45140 cve.org
- NVD entry CVE-2026-45140 nvd.nist.gov
Other references from the CVE record and advisory
- github.com github.com
- github.com github.com
- github.com github.com
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