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CVE-2026-42565— @workos/authkit-session: Open Redirect via state-derived redirect target

Quick assessment

Affected
workos authkit-session
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.

@workos/authkit-session是WorkOS开源的一个会话认证与令牌管理工具。 @workos/authkit-session 0.5.1之前版本存在输入验证错误漏洞，该漏洞源于AuthService.handleCallback中returnPathname值验证不足，可能导致攻击者通过OAuth状态参数影响重定向目标，进而使用户被重定向到外部攻击者控制的站点。

CVSS 4.3 · Medium EPSS 0.19% · P9

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 1

VendorProduct Version RangeStatus
workos authkit-session < 0.5.1 affected
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I. Basic Information for CVE-2026-42565

Vulnerability Information
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Vulnerability Title
@workos/authkit-session: Open Redirect via state-derived redirect target
Source: CVE Program / CVE List V5
Vulnerability Description
@workos/authkit-session is a toolkit for building WorkOS AuthKit framework integrations. Prior to 0.5.1, an open redirect vulnerability exists in AuthService.handleCallback due to insufficient validation of the returnPathname value derived from the OAuth state parameter. The state parameter is round-tripped through the identity provider (IdP) and can be influenced by an attacker. The handleCallback function decodes and returns returnPathname without enforcing restrictions on origin or scheme. As a result, attacker-controlled values may be returned to the application. If this value is used directly in a redirect, it may cause the user to be redirected to an external, attacker-controlled site. This vulnerability is fixed in 0.5.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A: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
@workos/authkit-session 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
@workos/authkit-session是WorkOS开源的一个会话认证与令牌管理工具。 @workos/authkit-session 0.5.1之前版本存在输入验证错误漏洞，该漏洞源于AuthService.handleCallback中returnPathname值验证不足，可能导致攻击者通过OAuth状态参数影响重定向目标，进而使用户被重定向到外部攻击者控制的站点。
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
workos authkit-session < 0.5.1 -

II. Public POCs for CVE-2026-42565

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III. Intelligence Information for CVE-2026-42565

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Patches & Fixes for CVE-2026-42565 (1)

Vendor Advisories for CVE-2026-42565 (1)

Other References for CVE-2026-42565 (1)

IV. Related Vulnerabilities

Same vendor: workos
Same weakness: CWE-601

V. Comments for CVE-2026-42565

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