CVE-2023-4220 in the critical feed json
Chamilo LMS Unauthenticated Big Upload File Remote Code Execution
published 2023-11-28 2 y ago modified 2026-06-17 4 mo ago also EUVD-2023-54093
- cvss
- 8.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 76.1%
- EPSS 76.1% chance of exploitation in 30 days, percentile 99.5%
- public exploits
- 2
- Metasploit, Exploit-DB, plus a Nuclei check
Summary
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.
Patch / fix
Timeline
- First public exploit (Metasploit exploit/linux/http/chamilo_bigupload_webshell)
- Published
Exploit prediction
76.08% chance of exploitation in the next 30 days, higher than 99.5% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- Metasploit exploit/linux/http/chamilo_bigupload_webshell Chamilo v1.11.24 Unrestricted File Upload PHP Webshell metasploit exploit, excellent rank, 2023-11-28
- EDB-52083 Chamilo LMS 1.11.24 - Remote Code Execution (RCE) webapps, 2025-03-18
- Nuclei template Chamilo LMS <= 1.11.24 - Remote Code Execution nuclei detection template
- starlabs.sg https://starlabs.sg/advisories/23/23-4220 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
Affected products
- Chamilo Chamilo
Classification
References
-
github.com
/chamilo/chamilo-lms/commit/3b487a55076fb06f96809b790a35dcdd42f8ec49
patch
-
starlabs.sg
/advisories/23/23-4220
third-party-advisory, exploit
-
support.chamilo.org
/projects/chamilo-18/wiki/security_issues#Issue-130-2023-09-04-Critical-impact-High-risk-Unauthenticated-users
vendor-advisory, issue-tracking
Sources
- CVE List CVE-2023-4220
- NVD CVE-2023-4220
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.