CVE-2023-4220 (GCVE-0-2023-4220)

Vulnerability from cvelistv5 – Published: 2023-11-28 07:11 – Updated: 2024-08-02 07:17
VLAI Shadowserver KEVIntel
Title
Chamilo LMS Unauthenticated Big Upload File Remote Code Execution
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.
Severity
8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
  • CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
References
Impacted products
Vendor Product Version
Chamilo Chamilo Affected: 0 , ≤ 1.11.24 (semver)
Create a notification for this product.
Credits
Ngo Wei Lin (@Creastery) of STAR Labs SG Pte. Ltd. (@starlabs_sg)
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 6982fb86-a126-486a-a607-b1430e9c0c2b

Vulnerability ID: CVE-2023-4220

Status: Confirmed

Status Updated: 2026-07-06 00:00 UTC

Exploited: Yes

Characteristics
Severity: 61.0
Timestamps
First Seen: 2024-12-05
Asserted: 2024-12-05
Last Seen: 2026-07-06
Scope
Asset Exposure: ['internet-facing']
Notes: Affected: Chamilo / Chamilo | Class: cms | Severity: Medium (CVSS 6.1) | IoT: no | In CISA KEV: no | Honeypot connections on 2026-07-06: 1
Evidence

Type: Honeypot

Signal: In The Wild Attempts

Confidence: 70%

Source: shadowserver

Details
1D 1
Iot no
Feed Shadowserver Foundation honeypot/exploited-vulnerabilities
Type http-scan
Class cms
7D Avg 0
Vendor Chamilo
30D Avg 1
90D Avg 0
Product Chamilo
Cisa Kev no
Connections 1
Observation Date 2026-07-06
Vulnerability Class CVSS
Vulnerability Score 6.1
Vulnerability Severity Medium
References
Created: 2026-06-30 09:23 UTC | Updated: 2026-07-08 01:03 UTC
KEVIntel
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: b97dfef4-26d1-436c-b776-dd3be38fbefb

Vulnerability ID: CVE-2023-4220

Status: Confirmed

Status Updated: 2023-11-28 07:11 UTC

Exploited: Yes

Timestamps
First Seen: 2023-11-28
Asserted: 2023-11-28
Scope
Notes: KEVIntel entry: Chamilo LMS Unauthenticated Big Upload File Remote Code Execution | Affected: Chamilo / Chamilo | CVSS: 8.1 (HIGH) | Used in malware: unknown | Not yet in CISA KEV: True
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title Chamilo LMS Unauthenticated Big Upload File Remote Code Execution
Vendor Chamilo
Product Chamilo
Added Date 2023-11-28T07:11:47.000Z
Cvss Score 8.1
Epss Score None
Cvss Severity HIGH
Epss Percentile None
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev True
References
Created: 2026-06-23 14:06 UTC | Updated: 2026-06-23 14:06 UTC
Show details on NVD website
To clipboard 

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    "redhat_vex": {
      "current_release_date": "2025-05-29T00:59:44+00:00",
      "cve": "CVE-2023-4220",
      "id": "CVE-2023-4220",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "Chamilo LMS Unauthenticated Big Upload File Remote Code Execution",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-4220.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.