GHSA-jrqm-vmqc-gm93

Source

https://github.com/advisories/GHSA-jrqm-vmqc-gm93

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-jrqm-vmqc-gm93/GHSA-jrqm-vmqc-gm93.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-jrqm-vmqc-gm93

Aliases

CVE-2026-28343

Published

2026-03-04T18:49:32Z

Modified

2026-03-19T19:01:33.116658Z

Severity

6.4 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N CVSS Calculator

Summary

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

Details

Impact

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 vulnerability affects only installations where the editor configuration meets the following criteria:

General HTML Support is enabled,
General HTML Support configuration allows inserting unsafe markup (see Security section to learn more).

Patches

The problem has been recognized and patched. The fix will be available in version 47.6.0 (and above).

Workarounds

CKEditor 5 recommends configuring General HTML Support securely to ensure that unsafe content is not accepted. Please refer to the Security section for detailed guidance.

Credits

CKEditor 5 would like to thank: - Emilio Kevin - Jeongwoo Lee, Younsoung Kim, Minseok Kim and Jinyeong Kim from ENKI Whitehat

for responsibly reporting this vulnerability.

For more information

Email us at security@cksource.com if you have any questions or comments about this advisory.

Database specific

{
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-04T18:49:32Z",
    "severity": "MODERATE",
    "nvd_published_at": "2026-03-05T20:16:16Z",
    "cwe_ids": [
        "CWE-79"
    ]
}

References

Affected packages

npm / @ckeditor/ckeditor5-html-support

Package

Name: @ckeditor/ckeditor5-html-support; View open source insights on deps.dev
Purl: pkg:npm/%40ckeditor/ckeditor5-html-support

Affected ranges

Type: SEMVER
Events: Introduced

29.0.0

Fixed

47.6.0

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-jrqm-vmqc-gm93/GHSA-jrqm-vmqc-gm93.json"

npm / ckeditor5

Package

Name: ckeditor5; View open source insights on deps.dev
Purl: pkg:npm/ckeditor5

Affected ranges

Type: SEMVER
Events: Introduced

29.0.0

Fixed

47.6.0

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-jrqm-vmqc-gm93/GHSA-jrqm-vmqc-gm93.json"