Open Redirect Vulnerability in KoaJS Koa Library
CVE-2025-8129

5.1MEDIUM

Key Information:

Vendor

Koajs

Status
Koa
Vendor
CVE Published:
25 July 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-8129?

An open redirect vulnerability has been identified in the KoaJS Koa library, specifically within the HTTP Header Handler in 'lib/response.js'. This flaw allows for the manipulation of the 'Referrer' argument, which can be exploited to redirect users to unintended external sites. The vulnerability potentially enables remote attackers to execute phishing schemes or lead users to malicious platforms without their consent. It is crucial to review and apply recommended mitigations to safeguard applications using affected versions of Koa.

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Affected Version(s)

Koa 3.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2025-8129 - Proof of Concept

References

https://vuldb.com/?id.317514
vdb-entrytechnical-description
https://vuldb.com/?ctiid.317514
signaturepermissions-required
https://vuldb.com/?submit.619741
third-party-advisory

CVSS V4

Score:
5.1
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

ZAST.AI (VulDB User)
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