HOMEVULNERABILITIESCVE-2023-3545
CRITICAL

CVE-2023-3545

CWE-178Published: November 28, 2023· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2023-3545 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

chamilo1 product(s)
chamilo
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/chamilo/chamilo-lms/commit/dc7bfce429fbd843a95a57c184b6992c4d709549
PATCHhttps://github.com/chamilo/chamilo-lms/commit/dc7bfce429fbd843a95a57c184b6992c4d709549
ADVISORYhttps://starlabs.sg/advisories/23/23-3545/
ADVISORYhttps://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
ADVISORYhttps://starlabs.sg/advisories/23/23-3545/
ADVISORYhttps://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

All References (6)

→
https://github.com/chamilo/chamilo-lms/commit/dc7bfce429fbd843a95a57c184b6992c4d709549Patch
→
https://starlabs.sg/advisories/23/23-3545/Exploit · Third 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-2023-3545Issue Tracking · Vendor Advisory
→
https://github.com/chamilo/chamilo-lms/commit/dc7bfce429fbd843a95a57c184b6992c4d709549Patch
→
https://starlabs.sg/advisories/23/23-3545/Exploit · Third 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-2023-3545Issue Tracking · Vendor Advisory

Quick Facts

CVE IDCVE-2023-3545
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-178
CISA KEVNo
Affected1 vendor(s)
PublishedNov 28, 2023

Related CVEs (CWE-178)

CVE-2026-54763
10.0
CVE-2026-40453
9.9
CVE-2022-29604
9.8
CVE-2025-59944
9.8
CVE-2004-2154
9.8
CVE-2004-2214
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2023-3545 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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