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CVE-2026-42349— Clerk: Authorization bypass when combining organization, billing, or reverification checks

Quick assessment

Affected
clerk javascript
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.

Official Clerk JavaScript SDKs是Clerk开源的一个用于 Clerk 身份验证的官方 Javascript 存储库。 Official Clerk JavaScript SDKs存在代码问题漏洞，该漏洞源于has()、auth.protect()及相关授权谓词在特定组合授权检查中可能返回true，可能导致不满足全部条件的用户绕过授权检查执行受限操作。

AI Predicted 7.5 Difficulty: Easy EPSS 0.43% · P36

Possible ATT&CK Techniques 1 AI

T1528 · Steal Application Access Token

Affected Version Matrix 29

VendorProduct Version RangeStatus
@clerk astro >= 2.0.0, <= 2.17.10 affected
>= 3.0.0, <= 3.0.17 affected
@clerk backend >= 2.0.0, <= 2.33.2 affected
>= 3.0.0, <= 3.2.13 affected
@clerk chrome-extension >= 1.3.5, <= 2.9.14 affected
>= 3.0.0, <= 3.1.14 affected
@clerk clerk-expo >= 2.2.11, <= 2.19.35 affected
@clerk clerk-react >= 5.9.0, <= 5.61.5 affected
@clerk expo >= 3.0.0, <= 3.2.1 affected
@clerk express >= 0.1.0, <= 1.7.78 affected
>= 2.0.0, <= 2.1.5 affected
@clerk fastify >= 1.0.42, <= 2.6.30 affected
>= 3.0.0, <= 3.1.15 affected
@clerk hono >= 0.0.2, <= 0.1.15 affected
@clerk nextjs >= 6.0.0, <= 6.39.2 affected
>= 7.0.0, <= 7.2.3 affected
@clerk nuxt >= 1.0.0, <= 1.13.28 affected
>= 2.0.0, <= 2.2.4 affected
@clerk react >= 6.0.0, <= 6.4.2 affected
@clerk react-router >= 0.0.1, <= 2.4.12 affected
>= 3.0.0, <= 3.1.3 affected
@clerk shared >= 3.0.0, <= 3.47.4 affected
>= 4.0.0, <= 4.8.2 affected
@clerk tanstack-react-start >= 0.0.1, <= 0.29.10 affected
>= 1.0.0, <= 1.1.3 affected
@clerk vue >= 1.0.0, <= 1.17.20 affected
>= 2.0.0, <= 2.0.15 affected
clerk javascript >= 5.22.0, < 5.125.10 affected
>= 6.0.0, < 6.7.5 affected
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I. Basic Information for CVE-2026-42349

Vulnerability Information
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Vulnerability Title
Clerk: Authorization bypass when combining organization, billing, or reverification checks
Source: CVE Program / CVE List V5
Vulnerability Description
Clerk JavaScript is the official JavaScript repository for Clerk authentication. has(), auth.protect(), and related authorization predicates in @clerk/shared, @clerk/nextjs, @clerk/backend, and other framework SDKs can return true for certain combined authorization checks when the result should be false, allowing a gated action to proceed for a user who does not satisfy the full set of requested conditions. This call shape can be bypassed if certain conditions are met: a has() or auth.protect() call that combines a reverification check with any of role, permission, feature, or plan, or that combines a billing check (feature or plan) with a role or permission check. This vulnerability is fixed in @clerk/clerk-js 5.125.10 and 6.7.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
对因果或异常条件的不恰当检查
Source: CVE Program / CVE List V5
Vulnerability Title
Official Clerk JavaScript SDKs 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Official Clerk JavaScript SDKs是Clerk开源的一个用于 Clerk 身份验证的官方 Javascript 存储库。 Official Clerk JavaScript SDKs存在代码问题漏洞，该漏洞源于has()、auth.protect()及相关授权谓词在特定组合授权检查中可能返回true，可能导致不满足全部条件的用户绕过授权检查执行受限操作。
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
clerk javascript >= 5.22.0, < 5.125.10 -
@clerk shared >= 3.0.0, <= 3.47.4 -
@clerk backend >= 2.0.0, <= 2.33.2 -
@clerk nextjs >= 6.0.0, <= 6.39.2 -
@clerk clerk-react >= 5.9.0, <= 5.61.5 -
@clerk react >= 6.0.0, <= 6.4.2 -
@clerk vue >= 1.0.0, <= 1.17.20 -
@clerk astro >= 2.0.0, <= 2.17.10 -
@clerk nuxt >= 1.0.0, <= 1.13.28 -
@clerk clerk-expo >= 2.2.11, <= 2.19.35 -
@clerk expo >= 3.0.0, <= 3.2.1 -
@clerk react-router >= 0.0.1, <= 2.4.12 -
@clerk tanstack-react-start >= 0.0.1, <= 0.29.10 -
@clerk chrome-extension >= 1.3.5, <= 2.9.14 -
@clerk fastify >= 1.0.42, <= 2.6.30 -
@clerk express >= 0.1.0, <= 1.7.78 -
@clerk hono >= 0.0.2, <= 0.1.15 -

II. Public POCs for CVE-2026-42349

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III. Intelligence Information for CVE-2026-42349

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Vendor Advisories for CVE-2026-42349 (1)

IV. Related Vulnerabilities

Same product: javascript
Same vendor: clerk
Same weakness: CWE-754

V. Comments for CVE-2026-42349

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