CVE-2023-4220: Chamilo LMS Unauthenticated Big Upload File Remote Code Execution

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 76.1% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2023-11-28 · updated 2026-06-17
Weakness: CWE-434

Description

Unrestricted file upload in big file upload functionality in `/main/inc/lib/javascript/bigupload/inc/bigUpload.php` in Chamilo LMS <= v1.11.24 allows unauthenticated attackers to perform stored cross-site scripting attacks and obtain remote code execution via uploading of web shell.

Affected products

chamilo-lms: through 1.11.24

References

https://github.com/chamilo/chamilo-lms/commit/3b487a55076fb06f96809b790a35dcdd42f8ec49
https://starlabs.sg/advisories/23/23-4220
https://support.chamilo.org/projects/chamilo-18/wiki/security_issues#Issue-130-2023-09-04-Critical-impact-High-risk-Unauthenticated-users-may-gain-XSS-and-unauthenticated-RCE-CVE-2023-4220
https://github.com/chamilo/chamilo-lms/commit/3b487a55076fb06f96809b790a35dcdd42f8ec49
https://starlabs.sg/advisories/23/23-4220
https://support.chamilo.org/projects/chamilo-18/wiki/security_issues#Issue-130-2023-09-04-Critical-impact-High-risk-Unauthenticated-users-may-gain-XSS-and-unauthenticated-RCE-CVE-2023-4220

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