Open Redirect Affecting koa package, versions >=2.16.2 <2.16.3>=3.0.1 <3.0.3
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-KOA-13653070
- published22 Oct 2025
- disclosed21 Oct 2025
- credithaymizrachi
Introduced: 21 Oct 2025
CVE-2025-62595 (opens in a new tab)How to fix?
Upgrade koa to version 2.16.3, 3.0.3 or higher.
Overview
koa is a Koa web app framework
Affected versions of this package are vulnerable to Open Redirect via the "back redirect" functionality. An attacker can cause users to be redirected to an external, attacker-controlled domain by supplying a specially crafted Referer header containing a protocol-relative URL (e.g., //evil.com), which is incorrectly treated as a safe relative path. This can be exploited for phishing, social engineering, or bypassing same-origin navigation protections.
Note: This is a bypass for the fix to the vulnerability reported in CVE-2025-8129.