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CVE-2026-41248— Official Clerk JavaScript SDKs: Middleware-based route protection bypass

Quick assessment

Affected
clerk astro
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存在安全漏洞，该漏洞源于createRouteMatcher可能被特制请求绕过，导致跳过中间件门控并到达下游处理程序。

CVSS 9.1 · Critical EPSS 0.32% · P25

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-41248

Vulnerability Information
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Vulnerability Title
Official Clerk JavaScript SDKs: Middleware-based route protection bypass
Source: CVE Program / CVE List V5
Vulnerability Description
Clerk JavaScript is the official JavaScript repository for Clerk authentication. createRouteMatcher in @clerk/nextjs, @clerk/nuxt, and @clerk/astro can be bypassed by certain crafted requests, allowing them to skip middleware gating and reach downstream handlers. This vulnerability is fixed in @clerk/astro 1.5.7, 2.17.10, and 3.0.15; @clerk/nextjs 5.7.6, 6.39.2, and 7.2.1; @clerk/nuxt 1.13.28 and 2.2.2; and @clerk/shared 2.22.1, 3.47.4, anc 4.8.1
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
解释冲突
Source: CVE Program / CVE List V5
Vulnerability Title
Official Clerk JavaScript SDKs 安全漏洞
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存在安全漏洞，该漏洞源于createRouteMatcher可能被特制请求绕过，导致跳过中间件门控并到达下游处理程序。
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)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
clerk astro >= 0.0.1, < 1.5.7 -
clerk nextjs >= 5.0.0, < 5.7.6 -
clerk nuxt >= 1.1.0, < 1.13.28 -
clerk shared >= 2.20.17, < 2.22.1 -

II. Public POCs for CVE-2026-41248

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III. Intelligence Information for CVE-2026-41248

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Vendor Advisories for CVE-2026-41248 (1)

IV. Related Vulnerabilities

Same product: astro
Same vendor: clerk
Same weakness: CWE-436

V. Comments for CVE-2026-41248

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