CVE-2025-62595
Severity CVSS v4.0:
Pending analysis
Type:
CWE-601
URL Redirection to Untrusted Site ('Open Redirect')
Publication date:
21/10/2025
Last modified:
21/10/2025
Description
Koa is expressive middleware for Node.js using ES2017 async functions. In versions 2.16.2 to before 2.16.3 and 3.0.1 to before 3.0.3, a bypass to CVE-2025-8129 was discovered in the Koa.js framework affecting its back redirect functionality. In certain circumstances, an attacker can manipulate the Referer header to force a user’s browser to navigate to an external, potentially malicious website. This occurs because the implementation incorrectly treats some specially crafted URLs as safe relative paths. Exploiting this vulnerability could allow attackers to perform phishing, social engineering, or other redirect-based attacks on users of affected applications. This issue has been patched in version 3.0.3.
Impact
Base Score 3.x
4.30
Severity 3.x
MEDIUM