CVE-2026-116687

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

publishedCWE-79

CKEditor 5 is a modern JavaScript rich-text editor with an MVC architecture. From 29.0.0 until 47.7.4 and 48.5.1, specially crafted markup can trigger cross-site scripting when General HTML Support is enabled and specifically configured to allow object content. Processing that content can execute attacker-controlled JavaScript in a browser context isolated from the origin of the application embedding the editor. This issue is fixed in versions 47.7.4 and 48.5.1.

Technical severity3.1 lowCVSS 3.1 · CNA: GitHub_M

Published2026-10-27Source updated 2026-11-03

Collected2026-11-033 attributed sources

Fixes and workarounds

Fix

ckeditor5 (npm): OSV reports a fixed version 47.7.4. Check the advisory for supported release branches.

Source: OSV GHSA-v6mg-96c6-gmpq

Fix

@ckeditor/ckeditor5-engine (npm): OSV reports a fixed version 47.7.4. Check the advisory for supported release branches.

Source: OSV GHSA-v6mg-96c6-gmpq

Fix

ckeditor5 (npm): OSV reports a fixed version 48.5.1. Check the advisory for supported release branches.

Source: OSV GHSA-v6mg-96c6-gmpq

Fix

@ckeditor/ckeditor5-engine (npm): OSV reports a fixed version 48.5.1. Check the advisory for supported release branches.

Source: OSV GHSA-v6mg-96c6-gmpq

Affected products and versions

Affected products, source version ranges and reporting authorities
Product	Versions	Authority
ckeditor5 ckeditor	>= 29.0.0, < 47.7.4 (affected) >= 48.0.0, < 48.5.1 (affected)	CNA: GitHub_M
ckeditor5 `ckeditor5` npm	≥ 29.0.0; < 47.7.4 (affected, semver); OSV events: introduced 29.0.0; fixed 47.7.4 Source events (semver) `[ { "introduced": "29.0.0" }, { "fixed": "47.7.4" } ]` Other versions: unaffected	OSV GHSA-v6mg-96c6-gmpq
@ckeditor/ckeditor5-engine `@ckeditor/ckeditor5-engine` npm	≥ 29.0.0; < 47.7.4 (affected, semver); OSV events: introduced 29.0.0; fixed 47.7.4 Source events (semver) `[ { "introduced": "29.0.0" }, { "fixed": "47.7.4" } ]` Other versions: unaffected	OSV GHSA-v6mg-96c6-gmpq
ckeditor5 `ckeditor5` npm	≥ 48.0.0; < 48.5.1 (affected, semver); OSV events: introduced 48.0.0; fixed 48.5.1 Source events (semver) `[ { "introduced": "48.0.0" }, { "fixed": "48.5.1" } ]` Other versions: unaffected	OSV GHSA-v6mg-96c6-gmpq
@ckeditor/ckeditor5-engine `@ckeditor/ckeditor5-engine` npm	≥ 48.0.0; < 48.5.1 (affected, semver); OSV events: introduced 48.0.0; fixed 48.5.1 Source events (semver) `[ { "introduced": "48.0.0" }, { "fixed": "48.5.1" } ]` Other versions: unaffected	OSV GHSA-v6mg-96c6-gmpq

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

CVSS assessments

CVSS scores, vectors and reporting authorities
Version / score	Vector	Authority
3.1 / 3.1 low	`CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N`	CNA: GitHub_M

Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

References

https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-v6mg-96c6-gmpqCNA: GitHub_M · x_refsource_CONFIRM
https://github.com/ckeditor/ckeditor5/commit/4d9c5bb34f63cd956d15ccafbe584e14280c86a0CNA: GitHub_M · x_refsource_MISC
https://github.com/ckeditor/ckeditor5/commit/a750e38635db6a18c5b11599c09f4fd702850423CNA: GitHub_M · x_refsource_MISC
https://github.com/ckeditor/ckeditor5/releases/tag/v47.7.4CNA: GitHub_M · x_refsource_MISC
https://github.com/ckeditor/ckeditor5/releases/tag/v48.5.1CNA: GitHub_M · x_refsource_MISC
https://github.com/advisories/GHSA-v6mg-96c6-gmpqOSV / GitHub Security Advisories · advisory
https://osv.dev/vulnerability/GHSA-v6mg-96c6-gmpqOSV / GitHub Security Advisories · osv

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