CVE-2026-28343 CKEditor: Cross-site scripting (XSS) in the HTML Support package
MediumCVSS 6.1
EPSS 0.32%
- Published
- Updated
- Exploit status
- No public exploit known
Description
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.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| ckeditor5 | = >= 29.0.0, < 47.6.0 | No fix listed |
| ckeditor @ckeditor/ckeditor5-html-support(npm) | >= 29.0.0, < 47.6.0 | 47.6.0 |
| npm ckeditor5(npm) | >= 29.0.0, < 47.6.0 | 47.6.0 |
| ubuntu/ckeditor3(Ubuntu:22.04) | All versions | No fix listed |
| ubuntu/ldap-account-manager(Ubuntu:22.04) | All versions | No fix listed |
| ubuntu/request-tracker4(Ubuntu:22.04) | All versions | No fix listed |
| ubuntu/ckeditor(Ubuntu:22.04) | All versions | No fix listed |
| ubuntu/ckeditor3(Ubuntu:24.04) | All versions | No fix listed |
| ubuntu/ldap-account-manager(Ubuntu:24.04) | All versions | No fix listed |
| ubuntu/request-tracker4(Ubuntu:24.04) | All versions | No fix listed |
| ubuntu/ckeditor(Ubuntu:24.04) | All versions | No fix listed |
| ubuntu/ldap-account-manager(Ubuntu:26.04) | All versions | No fix listed |
| ubuntu/request-tracker4(Ubuntu:26.04) | All versions | No fix listed |
| ckeditor5 | < 47.6.0 | 47.6.0 |
References
- https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-jrqm-vmqc-gm93 mitigation vendor-advisory
- https://github.com/ckeditor/ckeditor5/releases/tag/v29.0.0
- https://github.com/ckeditor/ckeditor5/releases/tag/v47.6.0 release-notes
- nvd.nist.gov third-party-advisory
- github.com
- Ubuntu CVE tracker vendor-advisory
- www.cve.org