CVE-2026-116688 CKEditor 5 - Prototype Pollution

CKEditor 5 45.0.0 to 47.7.4 and 48.5.1 contains a prototype pollution caused by vulnerable es-toolkit processing style attribute values, letting attackers execute unauthorized JavaScript in the browser, exploit requires crafted editor content.

CVSS base score 8.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.50% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Prototype Pollution
Impact
Client Script Exec
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Published
27 October 2026
Updated
29 October 2026
Weakness
CWE-79

Vendor fix

Update to versions 47.7.4 or 48.5.1 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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