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NVD / CVE Program· CNA STAR_Labs

CVE-2023-4220: Chamilo LMS Unauthenticated Big Upload File Remote Code Execution

Noroxi assessment

Priority: This week (action score 60/100)

  • A ready-made attack module is public (Metasploit, Nuclei); exploiting it takes no special expertise.
  • A ready-made attack tool exists and the flaw can be exploited over the network without an account, so priority is at least “This week”.
  • Probability of exploitation in the next 30 days: 76% (FIRST EPSS); higher than 99.5% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • No fixed version is recorded, but the references include a patch (commit or PR) link.
  • Severity is disputed: the assigning authority (CNA) scores it 8.1, NVD 6.1.

Don’t wait for the next maintenance window. See the fix and affected versions sections below.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 6.1 · v3.1—Weaponized No fix recorded
Published
Nov 28, 2023
Updated
Jun 17, 2026
EPSS
76.0% · 99th percentile

Report tools

JSON

Action score

60

This week

Don’t wait for the next maintenance window.

CVSS
24 / 40 · 6.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
23 / 30 · 76.0%
Ready-made attack tool
13 / 60 · floor: at least 60

CNA vs NVD score

NVD
6.1
CNA · STAR_Labs
8.1
2.0 point gap

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • Weaponized exploit exists
  • No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2023-4220

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
chamilochamilo lms

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • chamilo chamilo lmsup to 1.11.24 inclusive

Versions reported by the vendor

Affected version ranges reported by the assigning authority (STAR_Labs). Independent of NVD's CPE analysis and usually ahead of it.

  • Chamilo Chamilo

    • up to and including 1.11.24affected · semver

Same product

chamilo: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-35414Chamilo LMS v1.11.x was discovered to contain a SQL injection via the doc parameter in main/plagiarism/compilatio/upload.php.
    40Plan
  • CVE-2019-13082Chamilo LMS 1.11.8 and 2.x allows remote code execution through an lp_upload.php unauthenticated file upload feature.
    40Plan
  • CVE-2018-1999019Chamilo LMS version 11.x contains an Unserialization vulnerability in the "hash" GET parameter for the api endpoint located at /webservices/
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2023-34944Jun 13, 2023 · An arbitrary file upload vulnerability in the /fileUpload.lib.php component of Chamilo 1.11.* up to v1.11.18 allows attackers to execute arb
    39Monitor
  • ← EarlierCVE-2023-39582Sep 1, 2023 · SQL Injection vulnerability in Chamilo LMS v.1.11 thru v.1.11.20 allows a remote privileged attacker to obtain sensitive information via the
    19Monitor
  • Later →CVE-2023-4221Nov 28, 2023 · Chamilo LMS Learning Path PPT2LP Command Injection Vulnerability
    36Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Evidence

  • Metasploit module ×1
  • Exploit-DB entry ×1
  • Nuclei detection template ×1
  • Proof-of-concept repository on GitHub ×27

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Nuclei detection templateNuclei template CVE-2023-4220 —
Exploit-DB entrywebapps2025-03-18
Proof-of-concept repository on GitHubstars:12024-07-07
Proof-of-concept repository on GitHubstars:02024-07-07
Proof-of-concept repository on GitHubstars:12024-07-07
Proof-of-concept repository on GitHubstars:12024-07-07
Proof-of-concept repository on GitHubstars:52024-07-07
Proof-of-concept repository on GitHubstars:52024-07-08
Proof-of-concept repository on GitHubstars:02024-07-09
Proof-of-concept repository on GitHubstars:02024-07-11
Proof-of-concept repository on GitHubstars:02024-07-15
Proof-of-concept repository on GitHubstars:02024-07-29

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Metasploitsame day
  2. Published
  3. First PoC+222 d
  4. TodayOct 25, 2026+1063 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2023-34944168 days apartAn arbitrary file upload vulnerability in the /fileUpload.lib.php component of Chamilo 1.11.* up to v1.11.18 allows attackers to execute arb
    39Monitor
  • CVE-2023-42230 days apartChamilo LMS File Upload Functionality Remote Code Execution
    36Monitor
  • CVE-2023-42240 days apartChamilo LMS File Upload Functionality Remote Code Execution
    36Monitor
  • CVE-2023-42250 days apartChamilo LMS File Upload Functionality Remote Code Execution
    36Monitor
  • CVE-2023-42260 days apartChamilo LMS File Upload Functionality Remote Code Execution
    36Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
low · data or configuration can be modified
Availability
none

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Changed
Confidentiality impact
Low
Integrity impact
Low
Availability impact
None

Weakness class (CWE)

CWE-434 · Unrestricted Upload of File with Dangerous Type

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Show all references (1 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records