Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Koajs | Koa | >= 3.0.1, < 3.0.3 |
Related Weaknesses (CWE)
References
- https://github.com/koajs/koa/commit/769fd75cc6b30d72493b370b5a3ae2332ca03c5bPatch
- https://github.com/koajs/koa/security/advisories/GHSA-g8mr-fgfg-5qpcExploitVendor Advisory
- https://github.com/koajs/koa/security/advisories/GHSA-g8mr-fgfg-5qpcExploitVendor Advisory
FAQ
What is CVE-2025-62595?
CVE-2025-62595 is a vulnerability with a CVSS score of 4.3 (MEDIUM). 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 a...
How severe is CVE-2025-62595?
CVE-2025-62595 has been rated MEDIUM with a CVSS base score of 4.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-62595?
Check the references section above for vendor advisories and patch information. Affected products include: Koajs Koa.