AIKIDO-2026-426017
drupal/core is vulnerable to Cross-site Scripting (XSS)
55
CVE Score
Medium
Cross-site Scripting (XSS)
TL;DR
Drupal core bundles CKEditor for WYSIWYG editing, and a high-severity XSS in the CKEditor engine can be triggered when that editor is enabled. An attacker who can create or edit content (even without CKEditor access) may inject crafted markup, including style attributes that hit a prototype-pollution flaw in CKEditor's es-toolkit dependency, and execute JavaScript in the browsers of users who open the WYSIWYG editor — including site admins. Drupal also notes a second, low-severity CKEditor XSS that does not affect core but may affect custom plugins.
How do I fix this?
Upgrade the drupal/core library to the patch version. Drupal 10.5.x and 11.2.x and below are end-of-life and do not receive security coverage — upgrade to a supported release (10.6.17, 11.3.17, or 11.4.7).
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and Drupal is configured to use CKEditor for WYSIWYG editing.
Package
Versions
10.5.0 - 10.6.16
Fixed in 10.6.1711.0.0 - 11.3.16
Fixed in 11.3.1711.4.0 - 11.4.6
Fixed in 11.4.7Background info
drupal/core is vulnerable to Cross-site Scripting (XSS) in versions 10.5.0 - 10.6.16, 11.0.0 - 11.3.16 and 11.4.0 - 11.4.6.
Get secure today,
quickly and for free.
Secure your code, cloud, and runtime in one central system. Connect a repo to discover what the reasoning agents find in your codebase.
No credit card required | Scan results in 32 seconds.
I consent to receiving marketing communications based on Aikido’s Privacy Policy.
SOC 2Compliant
ISO 27001CompliantISO 42001Compliant
FedRAMPAuthorized© All Intel data is openly available and commercially licensed.