CVE-2026-28343CWE-79

CKEditor: Cross-site scripting (XSS) in the HTML Support package

Medium · published March 5, 2026

CVSS v3.1
6.4
EPSS
0%
Percentile
29.6
In the wild
Unconfirmed
What it is

CKEditor 5 is a modern JavaScript rich-text editor with an MVC architecture. Starting in version 29.0.0 and prior to version 47.6.0, a cross-site scripting (XSS) vulnerability has been discovered in the General HTML Support feature. This vulnerability could be triggered by inserting specially crafted markup, leading to unauthorized JavaScript code execution, if the editor instance used an unsafe General HTML Support configuration. This issue has been patched in version 47.6.0.

The record
Technical detail
CVSS v3.1
6.4 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00369 · 29.6th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-03-05T19:42Z
EPSS history
Timeline
  • 05 MAR 19:42Z
    CKEditor: Cross-site scripting (XSS) in the HTML Support package
    cvelistv5