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CVE-2026-27191— Feathers: Open Redirect in OAuth callback enables account takeover

Quick assessment

Affected
feathersjs feathers
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Feathers是Feathers开源的一个轻量级的 Web 框架。用于使用 TypeScript 或 JavaScript 创建 API 和实时应用程序。 Feathers 5.0.39及之前版本存在输入验证错误漏洞，该漏洞源于重定向查询参数未经验证附加到基础来源，允许攻击者通过URL权限注入窃取访问令牌，可能导致账户接管。

AI Predicted 9.8 Difficulty: Easy EPSS 0.25% · P17

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise
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I. Basic Information for CVE-2026-27191

Vulnerability Information
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Vulnerability Title
Feathers: Open Redirect in OAuth callback enables account takeover
Source: CVE Program / CVE List V5
Vulnerability Description
Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript. Versions 5.0.39 and below the redirect query parameter is appended to the base origin without validation, allowing attackers to steal access tokens via URL authority injection. This leads to full account takeover, as the attacker obtains the victim's access token and can impersonate them. The application constructs the final redirect URL by concatenating the base origin with the user-supplied redirect parameter. This is exploitable when the origins array is configured and origin values do not end with /. An attacker can supply @attacker.com as the redirect value results in https://target.com@attacker.com#access_token=..., where the browser interprets attacker.com as the host, leading to full account takeover. This issue has been fixed in version 5.0.40.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
Source: CVE Program / CVE List V5
Vulnerability Title
Feathers 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Feathers是Feathers开源的一个轻量级的 Web 框架。用于使用 TypeScript 或 JavaScript 创建 API 和实时应用程序。 Feathers 5.0.39及之前版本存在输入验证错误漏洞，该漏洞源于重定向查询参数未经验证附加到基础来源，允许攻击者通过URL权限注入窃取访问令牌，可能导致账户接管。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
feathersjs feathers < 5.0.40 -

II. Public POCs for CVE-2026-27191

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III. Intelligence Information for CVE-2026-27191

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Vendor Advisories for CVE-2026-27191 (1)

Same Patch Batch · feathersjs · 2026-02-21 · 3 CVEs total

CVE-2026-27192 Feathers has an origin validation bypass via prefix matching
CVE-2026-27193 Feathers exposes internal headers via unencrypted session cookie

IV. Related Vulnerabilities

Same product: feathers
Same vendor: feathersjs
Same weakness: CWE-601

V. Comments for CVE-2026-27191

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