CVE-2025-62595
BaseFortify
Publication date: 2025-10-21
Last updated on: 2025-10-21
Assigner: GitHub, Inc.
Description
Description
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| koajs | koa | 2.16.2 |
| koajs | koa | 3.0.3 |
| koajs | koa | 3.0.1 |
| koajs | koa | 2.16.3 |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-601 | The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability in the Koa.js framework allows an attacker to manipulate the Referer header to force a user's browser to navigate to an external, potentially malicious website. It happens because the framework incorrectly treats some specially crafted URLs as safe relative paths, enabling a bypass of a previous vulnerability (CVE-2025-8129) related to back redirect functionality.
How can this vulnerability impact me? :
Exploiting this vulnerability could allow attackers to perform phishing, social engineering, or other redirect-based attacks on users of affected applications, potentially leading to compromised user trust or exposure to malicious sites.
What immediate steps should I take to mitigate this vulnerability?
Upgrade the Koa.js framework to version 3.0.3 or later, as this version contains the patch that fixes the vulnerability. Avoid using affected versions 2.16.2 to before 2.16.3 and 3.0.1 to before 3.0.3 to prevent exploitation of the back redirect bypass.