CVE-2024-24815: CKEditor4 Cross-site scripting (XSS) vulnerability caused by incorrect CDATA detection

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-02-07 · updated 2026-06-17
Weakness: CWE-79

Description

CKEditor4 is an open source what-you-see-is-what-you-get HTML editor. A cross-site scripting vulnerability has been discovered in the core HTML parsing module in versions of CKEditor4 prior to 4.24.0-lts. It may affect all editor instances that enabled full-page editing mode or enabled CDATA elements in Advanced Content Filtering configuration (defaults to `script` and `style` elements). The vulnerability allows attackers to inject malformed HTML content bypassing Advanced Content Filtering mechanism, which could result in executing JavaScript code. An attacker could abuse faulty CDATA content detection and use it to prepare an intentional attack on the editor. A fix is available in version 4.24.0-lts.

Affected products

ckeditor4: from 4.0 before 4.24.0 — fixed in 4.24.0

How to fix

Upgrade to a fixed version: ckeditor4 4.24.0. Check the vendor advisory for mitigations.

References

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