CVE-2023-3533

Name: CVE-2023-3533
Creator: NVD / NIST
Published: 2023-11-28T07:15:42.377+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.72%

Last modified Jun 17, 2026

CVE-2023-3533 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Path traversal in file upload functionality in `/main/webservices/additional_webservices.php` in Chamilo LMS <= v1.11.20 allows unauthenticated attackers to perform stored cross-site scripting attacks and obtain remote code execution via arbitrary file write.. EPSS estimates a 2.72% chance of exploitation in the next 30 days.

Description

Path traversal in file upload functionality in `/main/webservices/additional_webservices.php` in Chamilo LMS <= v1.11.20 allows unauthenticated attackers to perform stored cross-site scripting attacks and obtain remote code execution via arbitrary file write.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

2.72%

84.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Chamilo	Chamilo	<= 1.11.20

References

https://github.com/chamilo/chamilo-lms/commit/37be9ce7243a30259047dd4517c48ff8b21d657aPatch
https://starlabs.sg/advisories/23/23-3533/Exploit, Third Party Advisory
https://support.chamilo.org/projects/chamilo-18/wiki/security_issues#Issue-124-2023-07-13-Critical-impact-High-risk-Unauthenticated-Arbitrary-File-Write-RCE-CVE-2023-3533Issue Tracking, Patch, Vendor Advisory
https://github.com/chamilo/chamilo-lms/commit/37be9ce7243a30259047dd4517c48ff8b21d657aPatch
https://starlabs.sg/advisories/23/23-3533/Exploit, Third Party Advisory
https://support.chamilo.org/projects/chamilo-18/wiki/security_issues#Issue-124-2023-07-13-Critical-impact-High-risk-Unauthenticated-Arbitrary-File-Write-RCE-CVE-2023-3533Issue Tracking, Patch, Vendor Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2023-3533?

How severe is CVE-2023-3533?

CVE-2023-3533 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.72% probability of exploitation in the next 30 days.

How do I fix CVE-2023-3533?

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-2023-3533?

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

Scan your code now

Source: NVD / NIST