#VU123130 Open redirect in koa - CVE-2025-8129
Published: February 23, 2026
Vulnerability identifier: #VU123130
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2025-8129
CWE-ID: CWE-601
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
koa
koa
Software vendor:
Koa.js
Koa.js
Description
The vulnerability allows a remote user to redirect victims to arbitrary URL.
The vulnerability exists due to improper sanitization of user-supplied data in the function back in the library lib/response.js of the component HTTP Header Handler. A remote user can create a link that leads to a trusted website, however, when clicked, redirects the victim to arbitrary domain.
Successful exploitation of this vulnerability may allow a remote attacker to perform a phishing attack and steal potentially sensitive information.
Remediation
Install updates from vendor's website.