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CVE-2026-28343
CKEditor: Cross-site scripting (XSS) in the HTML Support package
Medium6.4EPSS 0.32%
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | Medium6.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N |
| NVDNVD · Modified | 3.1 | Medium6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
- EPSS (exploitation in 30 days)
- 0.32% · top 75% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
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The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.4.
Weakness
Affected products
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- npm@ckeditor/ckeditor5-html-supportGHSA-jrqm-vmqc-gm93 (opens in a new tab)
- npmckeditor5GHSA-jrqm-vmqc-gm93 (opens in a new tab)
References (3)
- https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-jrqm-vmqc-gm93 (opens in a new tab)x_refsource_CONFIRM
- https://github.com/ckeditor/ckeditor5/releases/tag/v29.0.0 (opens in a new tab)x_refsource_MISC
- https://github.com/ckeditor/ckeditor5/releases/tag/v47.6.0 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-jrqm-vmqc-gm93 (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-28343)Record last updated .