SB2026022332 - Open redirect in KoaJS Koa

Description

This security bulletin contains information about 1 vulnerability.

1) Open redirect (CVE-ID: CVE-2025-8129)

CWE-ID: CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')

CVSSv4: 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

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 update from vendor's website.

References

• https://github.com/koajs/koa/issues/1892
• https://github.com/koajs/koa/issues/1892#issue-3213028583
• https://vuldb.com/?ctiid.317514
• https://vuldb.com/?id.317514
• https://vuldb.com/?submit.619741