Koa Vulnerable to Open Redirect via Trailing Double-Slash (//) in back Redirect Logic

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

指向未可信站点的URL重定向(开放重定向)

koa 输入验证错误漏洞

koa是Koa.js开源的一个使用node.js表达性中间件。 koa 2.16.2版本至2.16.3之前版本和3.0.1版本至3.0.3之前版本存在输入验证错误漏洞，该漏洞源于错误处理特制URL，可能导致重定向攻击。

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