Medium severity6.4NVD Advisory· Published Mar 5, 2026· Updated Jun 17, 2026
CVE-2026-28343
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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LLM-synthesized narrative grounded in this CVE's description and references.
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
4- 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
- github.com/ckeditor/ckeditor5/security/advisories/GHSA-jrqm-vmqc-gm93nvdMitigationVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-28343ghsaADVISORY
- github.com/ckeditor/ckeditor5/releases/tag/v29.0.0nvdWEB
- github.com/ckeditor/ckeditor5/releases/tag/v47.6.0nvdRelease NotesWEB
News mentions
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