What is GHSA-PXMP-FWJC-4X7Q?

GHSA-PXMP-FWJC-4X7Q is a medium-severity cross-site scripting (XSS) vulnerability in marky-markdown (npm), affecting versions >= 0.0.0. No fixed version is listed yet. Untrusted input is rendered as active markup in a victim's browser, which can run script in their session.

Which versions of marky-markdown are affected by GHSA-PXMP-FWJC-4X7Q?

marky-markdown (npm) versions >= 0.0.0 is affected.

Is there a fix for GHSA-PXMP-FWJC-4X7Q?

No fixed version is listed for GHSA-PXMP-FWJC-4X7Q yet. Monitor the advisory for updates and apply mitigations in the interim.

Is GHSA-PXMP-FWJC-4X7Q exploitable, and should I be worried?

Whether GHSA-PXMP-FWJC-4X7Q is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk.

What actually determines whether GHSA-PXMP-FWJC-4X7Q is exploitable, and how bad it is?

Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.

How do I fix GHSA-PXMP-FWJC-4X7Q?

No fixed version is listed yet. In the interim: Validate and encode untrusted input before rendering it as HTML. Applying a Content Security Policy reduces the impact if encoding is bypassed.

GHSA-PXMP-FWJC-4X7Q in marky-markdown

Summary

HTML Injection in marky-markdown

All versions of marky-markdown are vulnerable to HTML Injection due to a validation bypass. The package only allows iframes where the source is youtube.com but it is possible to bypass the validation with sources where youtube.com is the sub-domain, such as youtube.com.evil.co. This

Impact

Untrusted input is rendered as active markup in a victim's browser, which can run script in their session. Typical impact: session or credential theft, and actions taken as the user.

Affected versions

marky-markdown (>= 0.0.0)

Security releases

Not available

Kodem intelligence

Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.

Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.

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Remediation advice

This package is no longer maintained. Please upgrade to @npmcorp/marky-markdown

Frequently Asked Questions

What is GHSA-PXMP-FWJC-4X7Q? GHSA-PXMP-FWJC-4X7Q is a medium-severity cross-site scripting (XSS) vulnerability in marky-markdown (npm), affecting versions >= 0.0.0. No fixed version is listed yet. Untrusted input is rendered as active markup in a victim's browser, which can run script in their session.
Which versions of marky-markdown are affected by GHSA-PXMP-FWJC-4X7Q? marky-markdown (npm) versions >= 0.0.0 is affected.
Is there a fix for GHSA-PXMP-FWJC-4X7Q? No fixed version is listed for GHSA-PXMP-FWJC-4X7Q yet. Monitor the advisory for updates and apply mitigations in the interim.
Is GHSA-PXMP-FWJC-4X7Q exploitable, and should I be worried? Whether GHSA-PXMP-FWJC-4X7Q is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
What actually determines whether GHSA-PXMP-FWJC-4X7Q is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
How do I fix GHSA-PXMP-FWJC-4X7Q? No fixed version is listed yet. In the interim: Validate and encode untrusted input before rendering it as HTML. Applying a Content Security Policy reduces the impact if encoding is bypassed.

Other vulnerabilities in marky-markdown

CVE-IDSeverityPackage summary

GHSA-MG69-6J3M-JVGWHighmarky-markdown: HTML Injection in marky-markdown