Chamilo LMS Htaccess File Upload Security Bypass
Published Nov 28, 2023
9.8
CRITICALCVSS 3.1
EPSS 2.44%
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
-
- Version 0StatusaffectedConstraints<=1.11.20
- Version
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
Score over time
2023–2026- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (14 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 2.44% (0.02438) | 83.73th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.96% (0.01963) | 77.68th | v5 (v2026.06.15) |
| Nov 21, 2025 | 2.99% (0.02987) | 86.05th | v4 (v2025.03.14) |
| Nov 18, 2025 | 5.95% (0.05954) | 89.73th | v4 (v2025.03.14) |
| Apr 15, 2025 | 2.58% (0.02577) | 84.67th | v4 (v2025.03.14) |
| Mar 30, 2025 | 5.95% (0.05954) | 89.70th | v4 (v2025.03.14) |
| Mar 29, 2025 | 38.66% (0.38663) | 95.85th | v4 (v2025.03.14) |
| Mar 24, 2025 | 5.95% (0.05954) | 89.71th | v4 (v2025.03.14) |
| Mar 23, 2025 | 15.07% (0.15070) | 93.69th | v4 (v2025.03.14) |
| Mar 17, 2025 | 5.56% (0.05556) | 89.58th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.57% (0.00569) | 78.58th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.45% (0.00445) | 74.20th | v3 (v2023.03.01) |
| Dec 5, 2023 | 0.45% (0.00445) | 72.06th | v3 (v2023.03.01) |
| Nov 28, 2023 | 0.06% (0.00064) | 26.82th | v3 (v2023.03.01) |
References (3)
- https://github.com/chamilo/chamilo-lms/commit/dc7bfce429fbd843a95a57c184b6992c4d709549 patch
- https://starlabs.sg/advisories/23/23-3545/ third-party-advisoryExploitThird Party Advisory
- 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 vendor-advisoryIssue TrackingVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://github.com/chamilo/chamilo-lms/commit/dc7bfce429fbd843a95a57c184b6992c4d709549 | patch | |
| https://starlabs.sg/advisories/23/23-3545/ | third-party-advisoryExploitThird Party Advisory | |
| 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 | vendor-advisoryIssue TrackingVendor Advisory |
Change history (0)
No recorded changes yet.