# CVE-2023-3545

## Summary

- **CVE ID:** CVE-2023-3545
- **Severity:** CRITICAL
- **CVSS Score:** 9.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** CWE-178
- **Published:** Nov 28, 2023
- **Last Modified:** Mar 13, 2026

## Description

Improper sanitisation in `main/inc/lib/fileUpload.lib.php` in Chamilo LMS <= v1.11.20 on Windows and Apache installations allows unauthenticated attackers to bypass file upload security protections and obtain remote code execution via uploading of `.htaccess` file. This vulnerability may be exploited by privileged attackers or chained with unauthenticated arbitrary file write vulnerabilities, such as CVE-2023-3533, to achieve remote code execution.

## Affected Products

- Chamilo — Chamilo (0)

## References

- [CNA](https://support.chamilo.org/projects/chamilo-18/wiki/security_issues#Issue-125-2023-07-13-Critical-impact-Moderate-risk-Htaccess-File-Upload-Security-Bypass-on-Windows-CVE-2023-3545)
- [CNA](https://starlabs.sg/advisories/23/23-3545/)
- [CNA](https://github.com/chamilo/chamilo-lms/commit/dc7bfce429fbd843a95a57c184b6992c4d709549)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 2.99%
- **EPSS Percentile:** 86.3

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-19._