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.
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Affected Vendors & Products
Advisories
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GHSA-g8mr-fgfg-5qpc | Koa Vulnerable to Open Redirect via Trailing Double-Slash (//) in back Redirect Logic |
Fixes
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
References
History
Tue, 21 Oct 2025 17:15:00 +0000
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Tue, 21 Oct 2025 16:30:00 +0000
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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. | |
Title | Koa Vulnerable to Open Redirect via Trailing Double-Slash (//) in back Redirect Logic | |
Weaknesses | CWE-601 | |
References |
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cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2025-10-21T16:35:48.461Z
Reserved: 2025-10-16T19:24:37.266Z
Link: CVE-2025-62595

Updated: 2025-10-21T16:35:40.490Z

Status : Awaiting Analysis
Published: 2025-10-21T17:15:40.737
Modified: 2025-10-21T19:31:25.450
Link: CVE-2025-62595

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