What is CVE-2023-53940?

CVE-2023-53940 is a high-severity vulnerability in Alfonzm Codigo Markdown Editor, classified under Code Injection. CVSS score: 7.8/10. Published 2025-12-18.

How severe is CVE-2023-53940?

High severity. CVSS v3 base score is 7.8 out of 10.

RCE in Alfonzm Codigo Markdown Editor

CVE-2023-53940

Codigo Markdown Editor 1.0.1 contains a code execution vulnerability that allows attackers to run arbitrary system commands by crafting a malicious markdown file. Attackers can embed a video source with an onerror event that executes shell commands through Node.js child_process module when the file is opened.

Vulnerability class: RCE (Remote Code Execution)

EPSS: 0.002 (6.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Alfonzm Codigo Markdown Editor — versions 1.0.1

Weakness classification (CWE)

CWE-94 — Code Injection

References

disclosure@vulncheck.com (exploit)
disclosure@vulncheck.com (product)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2023-53940?: CVE-2023-53940 is a high-severity vulnerability in Alfonzm Codigo Markdown Editor, classified under Code Injection. CVSS score: 7.8/10. Published 2025-12-18.
How severe is CVE-2023-53940?: High severity. CVSS v3 base score is 7.8 out of 10.