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CVE-2026-28343

CKEditor: Cross-site scripting (XSS) in the HTML Support package

Published: Mar 5, 2026Updated: Mar 5, 2026 Sources: CVE List NVD GHSACWE-79
6.4MEDIUM
NVD MITRE
EPSS Score
0.3%
Top 81.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

Description

CKEditor 5 has Cross-site Scripting (XSS) in the HTML Support package

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:CC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-79

Affected Products

npm
package-ecosystem
@ckeditor/ckeditor5-html-support
OSS Libraries
ckeditor5
OSS Libraries
ckeditor
oss-projectaka ckeditor5, ckeditor4
ckeditor5On-premWeb App
Web & CMS Plugins / cms-core

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-jrqm-vmqc-gm93
github.com
https://nvd.nist.gov/vuln/detail/CVE-2026-28343
nvd.nist.gov
https://github.com/ckeditor/ckeditor5
github.com
and 2 more references View all →
News mentions
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