CVE-2025-6674: CKEditor5 Youtube - Moderately critical - Cross-site Scripting - SA-CONTRIB-2025-081

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-06-26 · updated 2026-06-17
Weakness: CWE-79

Description

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Drupal CKEditor5 Youtube allows Cross-Site Scripting (XSS).This issue affects CKEditor5 Youtube: from 0.0.0 before 1.0.3.

Affected products

Drupal CKEditor5 Youtube: before 1.0.4 — fixed in 1.0.4

How to fix

Upgrade to a fixed version: Drupal CKEditor5 Youtube 1.0.4. Check the vendor advisory for mitigations.

References

https://www.drupal.org/sa-contrib-2025-081

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