PT-2026-28602 · Clerk · @Clerk/Express+3
Highnikosdouvlis
·
Published
2026-03-27
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Updated
2026-04-01
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CVE-2026-34076
CVSS v3.1
7.4
High
| Vector | AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |
Name of the Vulnerable Software and Affected Versions
@clerk/backend versions 3.0.0 through 3.2.2
@clerk/express versions 2.0.0 through 2.0.6
@clerk/hono versions 0.1.0 through 0.1.4
@clerk/fastify versions 3.1.0 through 3.1.4
Description
The
clerkFrontendApiProxy function is susceptible to Server-Side Request Forgery (SSRF). An unauthenticated attacker can manipulate a request path to cause the proxy to transmit the application's Clerk-Secret-Key to a server controlled by the attacker. The vulnerability affects applications that have explicitly enabled the frontendApiProxy feature.Recommendations
Upgrade to @clerk/backend version 3.2.3 or later.
Upgrade to @clerk/express version 2.0.7 or later.
Upgrade to @clerk/hono version 0.1.5 or later.
Upgrade to @clerk/fastify version 3.1.5 or later.
Rotate your Clerk Secret Key after upgrading.
Fix
SSRF
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Weakness Enumeration
Related Identifiers
Affected Products
@Clerk/Backend
@Clerk/Express
@Clerk/Fastify
@Clerk/Hono