CVE-2023-4220
High PUBLISHEDChamilo LMS Unauthenticated Big Upload File Remote Code Execution
Not yet in CISA KEV
Recommended Action
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
At a Glance
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.
- CVE Published
- Nov 28, 2023
- Exploitation Reported
- Nov 28, 2023
- CVSS
- 8.1 High
- EPSS
- —
Affected Versions
| Vendor | Product | Version | Status |
|---|---|---|---|
| Chamilo |
Chamilo
|
0 to <= 1.11.24 |
Affected |
CVE References
- Vendor Advisory — support.chamilo.org support.chamilo.org · Vendor Advisory https://support.chamilo.org/projects/chamilo-18/wiki/security_issues#...
- GitHub — chamilo/chamilo-lms github.com · Patch https://github.com/chamilo/chamilo-lms/commit/3b487a55076fb06f96809b7...
- Third-Party Advisory — starlabs.sg starlabs.sg · Third-Party Advisory https://starlabs.sg/advisories/23/23-4220
Recommended Actions
- Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
- Check enrichment artifacts for scanner coverage and available PoCs before rolling remediation validation.
- Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.
Known Exploited Vulnerability Sources
Catalogues that list this CVE as a known exploited vulnerability.
Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| The Shadowserver First | 2023-11-28 07:11 UTC |
Scanner Artifacts
Nuclei and Metasploit references linked to this CVE.
| Scanner | Reference | Detected |
|---|---|---|
| Nuclei | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2023/CVE-2023-4220.yaml | Apr 25, 2025 |
| Metasploit | https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/linux/http/chamilo_bigupload_webshell.rb | Apr 28, 2025 |
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users via the Pro API.
Learn About Virtual PatchesCVSS Scores
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploitation Status
Exploited in the wild
Recorded 2023-11-28 07:11:47 UTC · The Shadowserver
Proof of concept available
Recorded 2024-07-08 09:48:38 UTC · GitHub
Weaknesses (CWE)
-
Unrestricted Upload of File with Dangerous Type
Scanner Integrations
| Scanner | Reference | Detected |
|---|---|---|
| Metasploit | https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/linux/http/chamilo_bigupload_webshell.rb | Apr 28, 2025 |
| Nuclei | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2023/CVE-2023-4220.yaml | Apr 25, 2025 |
Potential Proof of Concepts
These PoCs are unverified and could contain malware. Use at your own risk.
github · Created 2024-12-04 22:16:12 UTC · 0 stars
Remote command execution exploit made for redteamers.
github · Created 2024-08-24 05:32:31 UTC · 0 stars
CVE-2023-4220 PoC Chamilo RCE
github · Created 2024-07-08 09:48:38 UTC · 5 stars
This is an Exploit for Unrestricted file upload in big file upload functionality in Chamilo-LMS for this location "/main/inc/lib/javascript/bigupload/inc/bigUpload.php" in Chamilo LMS <= v1.11.24, and Attackers can obtain remote code execution via uploading of web shell.
github · Created 2024-07-07 16:57:18 UTC · 1 stars
RCE Chamilo 1.11.24
nuclei · Created Unknown
Timeline
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
15:02 UTC about 1 year ago15:02 UTC · about 1 year ago
Metasploit module available
Exploit module available
-
00:00 UTC about 1 year ago00:00 UTC · about 1 year ago
Nuclei template available
Scanner coverage available
-
09:48 UTC about 2 years ago09:48 UTC · about 2 years ago
Public PoC available
Public proof-of-concept code published
-
07:11 UTC over 2 years ago07:11 UTC · over 2 years ago
CVE published
Vulnerability disclosed publicly
-
07:11 UTC over 2 years ago07:11 UTC · over 2 years ago
Added to KEVIntel KEV Feed
High-confidence, third-party attested exploitation
-
06:52 UTC almost 3 years ago06:52 UTC · almost 3 years ago
CVE ID reserved
Identifier reserved by the CNA
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2023-4220
{
"cve_id": "CVE-2023-4220",
"title": "Chamilo LMS Unauthenticated Big Upload File Remote Code Execution",
"affected_vendor": "Chamilo",
"affected_product": "Chamilo",
"affected_versions": [
{ "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
],
"confidence": "High",
"cvss_score": 8.1,
"epss_score": null,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}