Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ckeditor | Ckeditor5 | < 47.6.0 |
Related Weaknesses (CWE)
References
- https://github.com/ckeditor/ckeditor5/releases/tag/v29.0.0
- https://github.com/ckeditor/ckeditor5/releases/tag/v47.6.0Release Notes
- https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-jrqm-vmqc-gm93MitigationVendor Advisory
FAQ
What is CVE-2026-28343?
CVE-2026-28343 is a vulnerability with a CVSS score of 6.4 (MEDIUM). 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 t...
How severe is CVE-2026-28343?
CVE-2026-28343 has been rated MEDIUM with a CVSS base score of 6.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-28343?
Check the references section above for vendor advisories and patch information. Affected products include: Ckeditor Ckeditor5.