koajs koa up to 2.16.2/3.0.2 redirect

Summaryinfo

A vulnerability has been found in koajs koa up to 2.16.2/3.0.2 and classified as problematic. This impacts an unknown function. Performing a manipulation results in redirect. This vulnerability was named CVE-2025-62595. The attack may be initiated remotely. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as problematic has been found in koajs koa up to 2.16.2/3.0.2. This affects an unknown part. The manipulation with an unknown input leads to a redirect vulnerability. CWE is classifying the issue as CWE-601. A web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a Redirect. This simplifies phishing attacks. This is going to have an impact on integrity. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2025-62595 since 10/16/2025. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1204.001 according to MITRE ATT&CK.

Upgrading to version 2.16.3 or 3.0.3 eliminates this vulnerability. Applying the patch 769fd75cc6b30d72493b370b5a3ae2332ca03c5b is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• koajs

Name

• koa

Version

• 2.16.0
• 2.16.1
• 2.16.2
• 3.0.0
• 3.0.1
• 3.0.2

License

• open-source

Website

• Product: https://github.com/koajs/koa/

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CPE 2.2info

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