Main Vulnerability Database Vulnerabilities #VU154092

Reliance on Cookies without Validation and Integrity Checking in Happy DOM - #VU154092

Published: October 12, 2026

Vulnerability identifier: #VU154092

CSH Severity: Medium

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: N/A

CWE-ID: CWE-565

Exploitation vector: Remote access

Exploit availability: Public exploit is available

Vulnerability details

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to reliance on cookies without validation and integrity checking in the CookieContainer.ts and CookieURLUtility components. A remote attacker can inject forged session cookies into requests made to victim origins.

Affected software

Happy DOM

Remediation

Install updates from vendor's website.

Happy DOM - update to 20.14.6

Links to Public Exploits and PoC-codes

Exploit #13120 - Cookie scope forgery: no DNS-label boundary on Domain= matching , attacker origin sets victim cookies (October 12, 2026)

External References

https://github.com/capricorn86/happy-dom/security/advisories/GHSA-5fpq-26gf-qwcr

Related Security Bulletins

Reliance on Cookies without Validation and Integrity Checking in Happy DOM