GHSA-VFGC-C76H-MWH4

The Drupal project uses the CKEditor, library for WYSIWYG editing. CKEditor has released a security update that impacts Drupal.

Vulnerabilities are possible if Drupal is configured to allow use of the CKEditor library for WYSIWYG editing. An attacker that can create or edit content (even without access to CKEditor themselves) may be able to exploit one or more Cross-Site Scripting (XSS) vulnerabilities to target users with access to the WYSIWYG CKEditor, including site admins with privileged access.

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.

GHSA-VFGC-C76H-MWH4 has a CVSS score of 5.3 (Medium). The vector is network-reachable, no privileges required, and user interaction required. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (8.9.18, 9.1.12, 9.2.4); upgrading removes the vulnerable code path.

Kodem intelligence

1. What is GHSA-VFGC-C76H-MWH4? GHSA-VFGC-C76H-MWH4 is a medium-severity cross-site scripting (XSS) vulnerability in drupal/core (composer), affecting versions >= 8.0.0, < 8.9.18. It is fixed in 8.9.18, 9.1.12, 9.2.4. Untrusted input is rendered as active markup in a victim's browser, which can run script in their session.
2. How severe is GHSA-VFGC-C76H-MWH4? GHSA-VFGC-C76H-MWH4 has a CVSS score of 5.3 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which versions of drupal/core are affected by GHSA-VFGC-C76H-MWH4? drupal/core (composer) versions >= 8.0.0, < 8.9.18 is affected.
4. Is there a fix for GHSA-VFGC-C76H-MWH4? Yes. GHSA-VFGC-C76H-MWH4 is fixed in 8.9.18, 9.1.12, 9.2.4. Upgrade to this version or later.
5. Is GHSA-VFGC-C76H-MWH4 exploitable, and should I be worried? Whether GHSA-VFGC-C76H-MWH4 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
6. What actually determines whether GHSA-VFGC-C76H-MWH4 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.
7. How do I fix GHSA-VFGC-C76H-MWH4?
   • Upgrade drupal/core to 8.9.18 or later
   • Upgrade drupal/core to 9.1.12 or later
   • Upgrade drupal/core to 9.2.4 or later

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