CVE-2023-4220

HIGHNVD 8.19.0▲Weaponized

8.1

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.

CVSS v3: 8.1
EG Score: 9.0(high)
EPSS: 99.7%
KEV: Not listed

Published

November 28, 2023

Last Modified

November 21, 2024

References (6)

info@starlabshttps://github.com/chamilo/chamilo-lms/commit/3b487a55076fb06f96809b790a35dcdd42f8ec49
info@starlabshttps://starlabs.sg/advisories/23/23-4220
info@starlabshttps://support.chamilo.org/projects/chamilo-18/wiki/security_issues#Issue-130-2023-09-04-Critical-impact-High-risk-Unauthenticated-users-may-gain-XSS-and-unauthenticated-RCE-CVE-2023-4220
af854a3a-2127-422b-91ae-364da2661108https://github.com/chamilo/chamilo-lms/commit/3b487a55076fb06f96809b790a35dcdd42f8ec49
af854a3a-2127-422b-91ae-364da2661108https://starlabs.sg/advisories/23/23-4220
af854a3a-2127-422b-91ae-364da2661108https://support.chamilo.org/projects/chamilo-18/wiki/security_issues#Issue-130-2023-09-04-Critical-impact-High-risk-Unauthenticated-users-may-gain-XSS-and-unauthenticated-RCE-CVE-2023-4220

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 4× in last 7d / 12× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:12 UTCepss_batch
2026-06-02 20:12 UTCepss_batch
2026-06-01 13:51 UTCepss_batch
2026-06-01 13:51 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:43 UTCepss_batch
2026-05-26 13:43 UTCepss_batch
2026-05-24 13:14 UTCEG score recompute
2026-05-24 13:14 UTCGHSA enrichment
2026-05-23 20:35 UTCOSV refresh

Publicly available exploits

(5 references)

Working exploit code is in the public domain (1 Metasploit module) (2 GitHub PoCs) (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

Exploit-DBEDB-52083
First seen Mar 18, 2025
Chamilo LMS 1.11.24 - Remote Code Execution (RCE)
Open source ↗
GitHub PoCZiad-Sakr/Chamilo-CVE-2023-4220-Exploit
First seen Jul 8, 2024
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.
Open source ↗
GitHub PoCRai2en/CVE-2023-4220-Chamilo-LMS
First seen Jul 7, 2024
This is a script written in Python that allows the exploitation of the Chamilo's LMS software security flaw described in CVE-2023-4220
Open source ↗
Metasploitexploit/linux/http/chamilo_bigupload_webshell✓ verified
First seen Nov 28, 2023
Chamilo v1.11.24 Unrestricted File Upload PHP Webshell
Open source ↗
Nucleihttp/cves/2023/CVE-2023-4220.yaml
First seen Jan 1, 2023
Chamilo LMS <= 1.11.24 - Remote Code Execution
Open source ↗

Frequently asked(5)

What is CVE-2023-4220?

CVE-2023-4220 is a high vulnerability published on November 28, 2023. 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.

When was CVE-2023-4220 disclosed?

CVE-2023-4220 was first published in the National Vulnerability Database on November 28, 2023, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2023-4220 actively exploited?

CVE-2023-4220 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 99.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2023-4220?

CVE-2023-4220 has a CVSS v3 base score of 8.1 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.

How do I remediate CVE-2023-4220?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-4220, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2023-4220

📅 Published

🔄 Last Modified

🔗 References (6)

Weakness Classification(2)

Data Freshness Timeline

Publicly available exploits

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2023-4220?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (6)

Frequently asked(5)

Related CVEs(same CWE)