CVE-2023-4220

Name: CVE-2023-4220
Creator: NVD / NIST
Published: 2023-11-28T08:15:07.137+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 76.08%

Last modified Jun 17, 2026

CVE-2023-4220 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. 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.. EPSS estimates a 76.08% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

76.08%

99.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Chamilo	Chamilo Lms	<= 1.11.24

References

https://github.com/chamilo/chamilo-lms/commit/3b487a55076fb06f96809b790a35dcdd42f8ec49Patch
https://starlabs.sg/advisories/23/23-4220Exploit, Third Party Advisory
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-2023-4220Issue Tracking, Vendor Advisory
https://github.com/chamilo/chamilo-lms/commit/3b487a55076fb06f96809b790a35dcdd42f8ec49Patch
https://starlabs.sg/advisories/23/23-4220Exploit, Third Party Advisory
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-2023-4220Issue Tracking, Vendor Advisory

Timeline

Published: Nov 28, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-4220?

How severe is CVE-2023-4220?

CVE-2023-4220 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 76.08% probability of exploitation in the next 30 days.

How do I fix CVE-2023-4220?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-4220?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST