What is GHSA-JQ9Q-6P42-QPR7?

GHSA-JQ9Q-6P42-QPR7 is a high-severity cross-site scripting (XSS) vulnerability in ezsystems/ezdemo-ls-extension (composer), affecting versions >= 5.4.0, < 5.4.2.1. It is fixed in 5.4.2.1. Untrusted input is rendered as active markup in a victim's browser, which can run script in their session.

Which versions of ezsystems/ezdemo-ls-extension are affected by GHSA-JQ9Q-6P42-QPR7?

ezsystems/ezdemo-ls-extension (composer) versions >= 5.4.0, < 5.4.2.1 is affected.

Is there a fix for GHSA-JQ9Q-6P42-QPR7?

Yes. GHSA-JQ9Q-6P42-QPR7 is fixed in 5.4.2.1. Upgrade to this version or later.

Is GHSA-JQ9Q-6P42-QPR7 exploitable, and should I be worried?

Whether GHSA-JQ9Q-6P42-QPR7 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-JQ9Q-6P42-QPR7 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.

GHSA-JQ9Q-6P42-QPR7 in ezsystems/ezdemo-ls-extension

Q: Which versions of ezsystems/ezdemo-ls-extension are affected by GHSA-JQ9Q-6P42-QPR7?

ezsystems/ezdemo-ls-extension (composer) versions >= 5.4.0, < 5.4.2.1 is affected.

Q: Is there a fix for GHSA-JQ9Q-6P42-QPR7?

Yes. GHSA-JQ9Q-6P42-QPR7 is fixed in 5.4.2.1. Upgrade to this version or later.

Q: Is GHSA-JQ9Q-6P42-QPR7 exploitable, and should I be worried?

Whether GHSA-JQ9Q-6P42-QPR7 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.

Q: What actually determines whether GHSA-JQ9Q-6P42-QPR7 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.

Q: How do I fix GHSA-JQ9Q-6P42-QPR7?

Upgrade ezsystems/ezdemo-ls-extension to 5.4.2.1 or later.

Summary

Cross-site Scripting (XSS) in DemoBundle/ezdemo bundled VideoJS

his Security Advisory is about a vulnerability in VideoJS, which is bundled in DemoBundle and the ezdemo legacy extension. Older releases of VideoJS contain an XSS vulnerability in the Flash-based video player. This is bundled in DemoBundle, and in the Legacy "ezdemo" and "ezdemo-ls-extension" extensions. Among the branches still receiving security advisories, only eZ Publish Platform 5.4 and eZ Publish Legacy 5.4 are affected. However, it may be possible to make this software work in newer branches, so please check whether you have it installed even if you're using eZ Platform 1.x or 2.x.

Because DemoBundle / ezdemo are only intended for demo purposes, they are not supported software. For that reason, and given the old age of the software, and manpower issues during the Coronavirus crisis, we are taking the unusual step of simply removing the affected file. This resolves the vulnerability, but also breaks the video playback feature. It may be possible to make it work again by upgrading to a current version of VideoJS, but it is unlikely that we will do this, given the reasons already mentioned.

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

ezsystems/ezdemo-ls-extension (>= 5.4.0, < 5.4.2.1)

Security releases

ezsystems/ezdemo-ls-extension → 5.4.2.1 (composer)

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

Upgrade ezsystems/ezdemo-ls-extension to 5.4.2.1 or later to resolve this vulnerability.

Kodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.

Frequently Asked Questions

What is GHSA-JQ9Q-6P42-QPR7? GHSA-JQ9Q-6P42-QPR7 is a high-severity cross-site scripting (XSS) vulnerability in ezsystems/ezdemo-ls-extension (composer), affecting versions >= 5.4.0, < 5.4.2.1. It is fixed in 5.4.2.1. Untrusted input is rendered as active markup in a victim's browser, which can run script in their session.
Which versions of ezsystems/ezdemo-ls-extension are affected by GHSA-JQ9Q-6P42-QPR7? ezsystems/ezdemo-ls-extension (composer) versions >= 5.4.0, < 5.4.2.1 is affected.
Is there a fix for GHSA-JQ9Q-6P42-QPR7? Yes. GHSA-JQ9Q-6P42-QPR7 is fixed in 5.4.2.1. Upgrade to this version or later.
Is GHSA-JQ9Q-6P42-QPR7 exploitable, and should I be worried? Whether GHSA-JQ9Q-6P42-QPR7 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-JQ9Q-6P42-QPR7 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-JQ9Q-6P42-QPR7? Upgrade ezsystems/ezdemo-ls-extension to 5.4.2.1 or later.