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Vulnerabilities

Vulnerability · CVE-2026-116688

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 3, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-116688. EPSS is 0.50%. 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
High8.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.50%
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 is caused by a prototype pollution issue in the library used in the CKEditor 5 codebase. This vulnerability could lead to unauthorized JavaScript code execution when the editor processes incoming 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 (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>= 45.0.0, < 47.7.4
  • npm @ckeditor/ckeditor5-engine>= 48.0.0, < 48.5.1
  • npm ckeditor5>= 45.0.0, < 47.7.4
  • npm ckeditor5>= 48.0.0, < 48.5.1

How to fix CVE-2026-116688

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-2026-116688. EPSS is 0.50%. Act only if a listed version of CKEditor: Cross-site scripting (XSS) is installed.

Which versions are affected?

Compare what you have installed with >= 45.0.0, < 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 0.50%. 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 is caused by a prototype pollution issue in the library used in the CKEditor 5 codebase. This vulnerability could lead to unauthorized JavaScript code execution when the editor processes incoming attribute values. The underlying issue has been patched by the library maintainers, a

  2. Oct 27, 2026 · GitHub Advisory Database

    Updated

    ### 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 library used in the CKEditor 5 codebase. This vulnerability could lead to unauthorized JavaScript code execution when the editor processes incoming attribute values. The underlying issue has been patched by the library maintainers, a

Sources

  • CVE.orgVulnerability recordCVE-2026-116688

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-116688

    30-day exploitation probability 0.50%

    first.org
  • GitHub Advisory DatabasePackage advisoryGHSA-rh54-vffm-5fvp

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

    github.com
  • GitLab Advisory DatabasePackage advisoryCVE-2026-116688

    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 maintain

    advisories.gitlab.com

References

Freshness

Last verified in this catalog Nov 3, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 3, 2026
  • CVE.orgOct 28, 2026
  • GitLab Advisory DatabaseOct 28, 2026
  • GitHub Advisory DatabaseOct 28, 2026