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Fencer Intel
high 8.1

CVE-2026-116688 json

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

published 13d ago modified 7d ago also EUVD-2026-111364 , GHSA-rh54-vffm-5fvp

cvss
8.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 42%
public exploits
0
none known

Summary

CKEditor 5 is a modern JavaScript rich-text editor with an MVC architecture. From 45.0.0 until 47.7.4 and 48.5.1, the engine uses a vulnerable es-toolkit version whose prototype-pollution behavior can be reached while CKEditor processes incoming style attribute values. Crafted editor content can thereby cause unauthorized JavaScript execution in the browser. This issue is fixed in versions 47.7.4 and 48.5.1.

Patch / fix

  • npm ckeditor5 47.7.4, 48.5.1
  • npm @ckeditor/ckeditor5-engine 47.7.4, 48.5.1
  • ckeditor ckeditor5-list 47.7.4, 48.5.1
  • ckeditor ckeditor5-paste-from-office 47.7.4, 48.5.1
  • ckeditor ckeditor5-engine 47.7.4, 48.5.1
  • ckeditor ckeditor5-image 47.7.4, 48.5.1
  • ckeditor ckeditor5-media-embed 47.7.4, 48.5.1
  • ckeditor ckeditor5-widget 47.7.4, 48.5.1
  • ckeditor ckeditor5-markdown-gfm 47.7.4, 48.5.1
  • ckeditor ckeditor5-font 47.7.4, 48.5.1
  • ckeditor ckeditor5 47.7.4, 48.5.1

Is CVE-2026-116688 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
7d ago

Exploit prediction

0.50% chance of exploitation in the next 30 days, higher than 42% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 8.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
GitHub 3.1 8.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Affected packages

ecosystem package affected fixed in
npm ckeditor5
>=45.0.0, <47.7.4
>=48.0.0, <48.5.1
47.7.4
48.5.1
npm @ckeditor/ckeditor5-engine
>=45.0.0, <47.7.4
>=48.0.0, <48.5.1
47.7.4
48.5.1

Affected products

  • ckeditor ckeditor5

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.