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Vulnerability DatabaseCVE-2025-8129

CVE-2025-8129: 
JavaScript vulnerability analysis and mitigation

Overview

A vulnerability classified as problematic was discovered in KoaJS Koa versions up to 3.0.0, identified as CVE-2025-8129. The vulnerability affects the 'back' function in the lib/response.js component of the HTTP Header Handler. The issue was disclosed on July 25, 2025, and involves an open redirect vulnerability that can be exploited remotely (NVD, GitHub Issue).

Technical details

The vulnerability stems from an insecure implementation of the 'back' method used for redirect operations, which uses the user-controllable Referrer header as the redirect target. The CVSS v4.0 score is 5.1 (Medium), with the vector string CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P. The vulnerability is tracked as CWE-601 (URL Redirection to Untrusted Site) (Snyk, NVD).

Impact

The vulnerability allows an attacker to perform open redirect attacks by manipulating the Referrer argument, potentially redirecting users to arbitrary external sites. This could be exploited in phishing attacks or other malicious redirections (GitHub Issue).

Mitigation and workarounds

Users are advised to upgrade to Koa version 3.0.1 or higher, which contains the fix for this vulnerability (Snyk).

Additional resources

Source: This report was generated using AI

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