CVE-2026-118660 Happy DOM - Server Side Request Forgery

Happy DOM < 21.0.0 contains a server-side request forgery caused by default loading of iframe src and stylesheet href URLs during HTML parsing, letting attackers cause server-side requests to arbitrary endpoints, exploit requires control of parsed HTML.

CVSS base score 8.6 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
View the NVD record ↗

Details

Type
Server Side Request Forgery
Impact
Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Published
28 October 2026
Updated
29 October 2026
Weakness
CWE-918

Vendor fix

Update to version 21.0.0 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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