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CVE-2026-34076— Clerk JavaScript: SSRF in the opt-in clerkFrontendApiProxy feature may leak secret keys to unintended host

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@clerk/backend中的clerkFrontendApiProxy函数存在服务端请求伪造，可能导致未经验证的攻击者通过特制请求路径将应用程序的Clerk-Secret-Key发送至攻击者控制的服务器。

CVSS 7.4 · High EPSS 0.40% · P32
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I. Basic Information for CVE-2026-34076

Vulnerability Information
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Vulnerability Title
Clerk JavaScript: SSRF in the opt-in clerkFrontendApiProxy feature may leak secret keys to unintended host
Source: CVE Program / CVE List V5
Vulnerability Description
Clerk JavaScript is the official JavaScript repository for Clerk authentication. In @clerk/hono from versions 0.1.0 to before 0.1.5, @clerk/express from versions 2.0.0 to before 2.0.7, @clerk/backend from versions 3.0.0 to before 3.2.3, and @clerk/fastify from versions 3.1.0 to before 3.1.5, the clerkFrontendApiProxy function in @clerk/backend is vulnerable to Server-Side Request Forgery (SSRF). An unauthenticated attacker can craft a request path that causes the proxy to send the application's Clerk-Secret-Key to an attacker-controlled server. This issue has been patched in @clerk/hono version 0.1.5, @clerk/express version 2.0.7, @clerk/backend version 3.2.3, and @clerk/fastify version 3.1.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
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@clerk/backend中的clerkFrontendApiProxy函数存在服务端请求伪造，可能导致未经验证的攻击者通过特制请求路径将应用程序的Clerk-Secret-Key发送至攻击者控制的服务器。
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 @clerk/hono >= 0.1.0, < 0.1.5 -

II. Public POCs for CVE-2026-34076

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III. Intelligence Information for CVE-2026-34076

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Vendor Advisories for CVE-2026-34076 (1)

IV. Related Vulnerabilities

Same product: javascript
Same vendor: clerk
Same weakness: CWE-918

V. Comments for CVE-2026-34076

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