Platform
nodejs
Component
codigo-app
Fixed in
1.0.2
CVE-2023-53940 is a code execution vulnerability discovered in Codigo Markdown Editor versions 1.0.1–1.0.1. This flaw allows attackers to execute arbitrary system commands by crafting a malicious markdown file containing a specially crafted video source. The vulnerability stems from the improper handling of onerror events within embedded video elements, which can be exploited through the Node.js child_process module. A fix is expected in a future release.
An attacker exploiting CVE-2023-53940 can achieve remote code execution (RCE) on the system running Codigo Markdown Editor. This means they can execute arbitrary commands with the privileges of the user running the application. The attack vector involves crafting a malicious markdown file that, when opened, triggers the onerror event within an embedded video source. This event then executes shell commands via the Node.js child_process module. Successful exploitation could lead to complete system compromise, data theft, and further lateral movement within the network. The blast radius is significant, potentially impacting any system where the vulnerable version of Codigo Markdown Editor is deployed.
CVE-2023-53940 is not currently listed on the CISA KEV catalog. The EPSS score is likely to be medium, given the potential for RCE and the relatively straightforward attack vector. Public proof-of-concept (PoC) exploits are likely to emerge as the vulnerability gains more attention. The vulnerability was publicly disclosed on 2025-12-18.
Exploit Status
EPSS
0.03% (8% percentile)
CISA SSVC
CVSS Vector
Currently, no official patch is available for CVE-2023-53940. As a temporary workaround, restrict the ability to upload or open markdown files from untrusted sources. Implement strict input validation to sanitize markdown content, specifically targeting video source attributes and onerror event handlers. Consider using a Web Application Firewall (WAF) to filter malicious requests containing suspicious markdown patterns. Monitor system logs for unusual process executions or network activity related to Node.js. After a patch is released, upgrade Codigo Markdown Editor to the fixed version immediately. Verify the upgrade by attempting to open a known malicious markdown file and confirming that the onerror event does not trigger command execution.
Actualice a la última versión disponible del Codigo Markdown Editor. Verifique si el desarrollador ha lanzado una actualización que solucione la vulnerabilidad de ejecución de comandos arbitrarios. Como medida preventiva, evite abrir archivos Markdown de fuentes no confiables.
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CVE-2023-53940 is a code execution vulnerability in Codigo Markdown Editor versions 1.0.1–1.0.1 that allows attackers to run arbitrary system commands by crafting a malicious markdown file.
You are affected if you are using Codigo Markdown Editor version 1.0.1–1.0.1 and are allowing users to open or upload markdown files from untrusted sources.
Currently, no patch is available. Implement workarounds such as restricting file uploads, input validation, and WAF rules. Upgrade to a patched version when available.
While no active exploitation has been confirmed, the vulnerability is considered high severity and PoCs are likely to emerge.
Refer to the Codigo Markdown Editor project's official website and GitHub repository for updates and advisories regarding CVE-2023-53940.
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