GHSA-rh54-vffm-5fvp

Source

https://github.com/advisories/GHSA-rh54-vffm-5fvp

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-rh54-vffm-5fvp/GHSA-rh54-vffm-5fvp.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-rh54-vffm-5fvp

Aliases

CVE-2026-116688

Published

2026-10-27T21:05:06Z

Modified

2026-10-27T21:15:04Z

Severity

8.1 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N CVSS Calculator

Summary

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

Details

Impact

A Cross-Site Scripting (XSS) vulnerability has been discovered in the CKEditor 5 engine. This vulnerability is caused by a prototype pollution issue in the es-toolkit library used in the CKEditor 5 codebase. This vulnerability could lead to unauthorized JavaScript code execution when the editor processes incoming style attribute values.

The underlying issue has been patched by the library maintainers, and the fix has been incorporated into CKEditor 5.

Patches

The problem has been recognized and patched. The fix will be available in version 48.5.1 (and above) and 47.7.4 (LTS).

For more information

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

Database specific

{
    "cwe_ids":  [
        "CWE-79"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-10-27T21:05:06Z",
    "nvd_published_at":  null,
    "severity":  "HIGH"
}

References

Affected packages

npm / ckeditor5

Package

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

Affected ranges

Type: SEMVER
Events: Introduced

45.0.0

Fixed

47.7.4

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-rh54-vffm-5fvp/GHSA-rh54-vffm-5fvp.json"

npm / @ckeditor/ckeditor5-engine

Package

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

Affected ranges

Type: SEMVER
Events: Introduced

45.0.0

Fixed

47.7.4

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-rh54-vffm-5fvp/GHSA-rh54-vffm-5fvp.json"

npm / ckeditor5

Package

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

Affected ranges

Type: SEMVER
Events: Introduced

48.0.0

Fixed

48.5.1

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-rh54-vffm-5fvp/GHSA-rh54-vffm-5fvp.json"

npm / @ckeditor/ckeditor5-engine

Package

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

Affected ranges

Type: SEMVER
Events: Introduced

48.0.0

Fixed

48.5.1

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-rh54-vffm-5fvp/GHSA-rh54-vffm-5fvp.json"