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Vulnerabilities

Vulnerability · CVE-2026-116687

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

Published Oct 27, 2026 · catalog updated Oct 27, 2026 · CKEditor: Cross-site scripting (XSS)

Last checked Nov 6, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-116687. EPSS is 0.25%. Act only if a listed version of CKEditor: Cross-site scripting (XSS) is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (CKEditor: Cross-site scripting (XSS)).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Low3.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.25%
Remediation
Version ranges on file
Affected products
npm @ckeditor · npm @ckeditor/ckeditor5-engine · npm ckeditor5

### Impact A Cross-Site Scripting (XSS) vulnerability has been discovered in the CKEditor 5 engine. This vulnerability could be triggered by inserting specially crafted markup under a specific General HTML Support configuration that allows inserting objects, leading to unauthorized JavaScript code execution in a browser context isolated from the origin of the application embedding the editor. This vulnerability affects only installations where General HTML Support is enabled and configured to allow the affected HTML content. ### Patches The problem has been recognized and patched. The fix will be available in version (and above) and (LTS). ### For more information Email us at [security@cksource.com](mailto:security@cksource.com) if you have any questions or comments about this advisory.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • npm @ckeditorversion unspecified
  • npm @ckeditor/ckeditor5-engine>= 29.0.0, < 47.7.4
  • npm @ckeditor/ckeditor5-engine>= 48.0.0, < 48.5.1
  • npm ckeditor5>= 29.0.0, < 47.7.4
  • npm ckeditor5>= 48.0.0, < 48.5.1

How to fix CVE-2026-116687

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-116687. EPSS is 0.25%. Act only if a listed version of CKEditor: Cross-site scripting (XSS) is installed.

Which versions are affected?

Compare what you have installed with >= 29.0.0, < 47.7.4, >= 48.0.0, < 48.5.1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-79: Cross-site Scripting (XSS). EPSS 0.25%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 27, 2026 · GitHub Advisory Database

    Detected

    ### Impact A Cross-Site Scripting (XSS) vulnerability has been discovered in the CKEditor 5 engine. This vulnerability could be triggered by inserting specially crafted markup under a specific General HTML Support configuration that allows inserting objects, leading to unauthorized JavaScript code execution in a browser context isolated from the origin of the application embedding the editor. This

Sources

  • CVE.orgVulnerability recordCVE-2026-116687

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-116687

    30-day exploitation probability 0.25%

    first.org
  • GitHub Advisory DatabasePackage advisoryGHSA-v6mg-96c6-gmpq

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

    github.com
  • GitLab Advisory DatabasePackage advisoryCVE-2026-116687

    A Cross-Site Scripting (XSS) vulnerability has been discovered in the CKEditor 5 engine. This vulnerability could be triggered by inserting specially crafted markup under a specific General HTML Support configuration that allows inserting objects, leading to unauthorized JavaScript code execution in a browser context isolated from the origin of the application embedding the editor. This vulnerabil

    advisories.gitlab.com

References

Freshness

Last verified in this catalog Nov 6, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 6, 2026
  • CVE.orgOct 28, 2026
  • GitLab Advisory DatabaseOct 28, 2026
  • GitHub Advisory DatabaseOct 28, 2026