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EUVD-2026-276611

fkie_cve-2026-28343

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.

GHSA-jrqm-vmqc-gm93 — CKEditor 5 has Cross-site Scripting (XSS) in the HTML Support package

Affected: npm: @ckeditor/ckeditor5-html-support, npm: ckeditor5

### Impact 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 vulnerability affects only installations where the editor configuration meets the following criteria:

* [General HTML Support](https://ckeditor.com/docs/ckeditor5/latest/features/html/general-html-support.html) is enabled, * General HTML Support configuration allows inserting unsafe markup (see [Security](https://ckeditor.com/docs/ckeditor5/latest/features/html/general-html-support.html#security) section to learn more).

### Patches The problem has been recognized and patched. The fix will be available in version 47.6.0 (and above).

### Workarounds CKEditor 5 recommends configuring General HTML Support securely to ensure that unsafe content is not accepted. Please refer to the [Security](https://ckeditor.com/docs/ckeditor5/latest/features/html/general-html-support.html#security) section for detailed guidance.

### Credits CKEditor 5 would like to thank: - Emilio Kevin - Jeongwoo Lee, Younsoung Kim, Minseok Kim and Jinyeong Kim from ENKI Whitehat

for responsibly reporting this vulnerability.

### For more information Email us at [security@cksource.com](mailto:security@cksource.com) if you have any questions or comments about this advisory.

UBUNTU-CVE-2026-28343

Affected: Ubuntu:Pro:16.04:LTS: ckeditor, Ubuntu:16.04:LTS: ldap-account-manager, Ubuntu:16.04:LTS: request-tracker4, Ubuntu:Pro:18.04:LTS: ckeditor, Ubuntu:18.04:LTS: ckeditor3, Ubuntu:18.04:LTS: ldap-account-manager, Ubuntu:Pro:18.04:LTS: request-tracker4, Ubuntu:Pro:20.04:LTS: ckeditor, Ubuntu:20.04:LTS: ckeditor3, Ubuntu:20.04:LTS: ldap-account-manager and 14 more