Moderate severityNVD Advisory· Published Mar 5, 2026· Updated Mar 19, 2026
CKEditor: Cross-site scripting (XSS) in the HTML Support package
CVE-2026-28343
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
@ckeditor/ckeditor5-html-supportnpm | >= 29.0.0, < 47.6.0 | 47.6.0 |
ckeditor5npm | >= 29.0.0, < 47.6.0 | 47.6.0 |
Affected products
3- ghsa-coords2 versions
>= 29.0.0, < 47.6.0+ 1 more
- (no CPE)range: >= 29.0.0, < 47.6.0
- (no CPE)range: >= 29.0.0, < 47.6.0
Patches
Vulnerability mechanics
References
5- github.com/advisories/GHSA-jrqm-vmqc-gm93ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-28343ghsaADVISORY
- github.com/ckeditor/ckeditor5/releases/tag/v29.0.0ghsax_refsource_MISCWEB
- github.com/ckeditor/ckeditor5/releases/tag/v47.6.0ghsax_refsource_MISCWEB
- github.com/ckeditor/ckeditor5/security/advisories/GHSA-jrqm-vmqc-gm93ghsax_refsource_CONFIRMWEB
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