CKEditor 5 vulnerabilitiesCKEditor 5: known vulnerabilities and safe versions
npm: ckeditor5
CKEditor 5 has 7 known vulnerability records: 3 in the npm advisory data (GitHub Advisory Database via OSV, the same source npm audit uses) and 4 only in Retire.js (CDN builds and advisories without a CVE).
By branch: 47.x is safe from 47.6.0; 46.x has no fixed release in the records; 45.x has no fixed release in the records; 44.x has no fixed release in the records.
Vulnerabilities and safe version by branch
Safe version: on that branch, this release and every later one (up to the branch's latest release, where known) fall outside every known record's range. Candidates are only the records' own fixed versions and the branch's latest release; "No fix" means moving off the branch.
| Branch | Support | Latest on branch | Records | Safe version |
|---|---|---|---|---|
| 47.x | — | — | 1medium | 47.6.0 |
| 46.x | — | — | 2medium | No fix |
| 45.x | — | — | 2medium | No fix |
| 44.x | — | — | 2medium | No fix |
| 43.x | — | — | 2medium | No fix |
| 40.x | — | — | 2medium | No fix |
| 35.x | — | — | 1medium | No fix |
| 29.x | — | — | 2medium | No fix |
| 27.x | — | — | 1medium | No fix |
| 25.x | — | — | 2medium | No fix |
| 10.x | — | — | 4medium | No fix |
Support dates appear only for libraries that endoflife.date tracks.
Records
Newest first. Ranges are the record's own data; several ranges mean separate fixes per branch.
CVE-2026-283432026-03-05
CKEditor: Cross-site scripting (XSS) in the HTML Support package
Affected versions: >= 29.0.0, < 47.6.0
medium 6.1
Fixed in: 47.6.0
CVE-2025-580642025-09-04
CKEditor is susceptible to Cross-Site Scripting (XSS) through its clipboard package
Affected versions: >= 46.0.0, < 46.0.3 · >= 44.2.0, < 45.2.2
low 2.3
Fixed in: 45.2.2, 46.0.3
CVE-2024-456132024-09-25
CKEditor 5 has Cross-site Scripting vulnerability in the clipboard package
Affected versions: >= 40.0.0, < 43.1.1
medium 5.1
Fixed in: 43.1.1
CVE-2022-311752022-08-03
Cross-site scripting caused by the editor instance destroying process in ckeditor5
Affected versions: < 35.0.0
medium 4.7
Fixed in: 35.0.0
CVE-2021-213912021-04-28
Regular expression Denial of Service in multiple packages
Affected versions: < 27.0.0
medium 6.5
Fixed in: 27.0.0
EPSS 1.6%
CVE-2021-212542021-01-29
Regular expression Denial of Service in Markdown plugin
Affected versions: < 25.0.0
medium 6.5
Fixed in: 25.0.0
EPSS 1.7%
CVE-2018-110932018-05-22
Cross-site scripting (XSS) vulnerability in the Link package for CKEditor 5 before 10.0.1 allows remote attackers to inject arbitrary web sc
Affected versions: < 10.0.1
medium 6.1
Fixed in: 10.0.1
EPSS 1%
Sources and method
Ranges: GitHub Advisory Database (OSV npm export, daily) and Retire.js (Apache-2.0). Exploitation: CISA KEV, FIRST EPSS and exploit maturity from the Noroxi CVE database. Support dates: endoflife.date.
This page and the JavaScript library scan use the same matching rule: a row without bounds is not evidence, and versions are compared in one place. A record without a version range never counts as "affected" in the version check.
Data as of October 22, 2026.