Bug 2444907 (CVE-2026-28343)

Summary: CVE-2026-28343 ckeditor: CKEditor: Unauthorized JavaScript code execution via specially crafted markup in General HTML Support
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in CKEditor. This cross-site scripting (XSS) vulnerability in the General HTML Support feature allows an attacker to execute unauthorized JavaScript code. This can occur by inserting specially crafted markup if the editor instance is configured with unsafe General HTML Support settings.
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Bug Depends On: 2444955    
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Description OSIDB Bzimport 2026-03-05 20:01:53 UTC
CKEditor 5 is a modern JavaScript rich-text editor with an MVC architecture. 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.