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CVE-2026-42349

High

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.

SeverityHigh
CVSS8.1
Exploit probability—
Product@clerk/shared
PublishedMay 11, 2026
First seenMay 11, 2026
Weakness typeCWE-754CWE-754CWE-863Incorrect authorization

How to fix

Update
  • @clerk/shared3.47.5, 4.8.3 or later
  • clerk clerk\/astro2.17.11, 3.0.18 or later
  • clerk clerk\/backend2.33.3, 3.2.14 or later
  • clerk clerk\/chrome-extension2.9.15, 3.1.15 or later
  • clerk clerk\/clerk-expo2.19.36 or later
  • clerk clerk\/clerk-js5.125.10, 6.7.5 or later
  • clerk clerk\/clerk-react5.61.6 or later
  • clerk clerk\/expo3.2.2 or later
  • clerk clerk\/express1.7.79, 2.1.6 or later
  • clerk clerk\/fastify2.6.31, 3.1.16 or later
  • clerk clerk\/hono0.1.16 or later
  • clerk clerk\/nextjs7.2.4 or later

Affected products

ProductAffected versionsFixed in
@clerk/sharednpm3.0.0 ≤ v < 3.47.5, 4.0.0 ≤ v < 4.8.33.47.5, 4.8.3
clerk clerk\/astro2.0.0 ≤ v < 2.17.11, 3.0.0 ≤ v < 3.0.182.17.11, 3.0.18
clerk clerk\/backend2.0.0 ≤ v < 2.33.3, 3.0.0 ≤ v < 3.2.142.33.3, 3.2.14
clerk clerk\/chrome-extension1.3.5 ≤ v < 2.9.15, 3.0.0 ≤ v < 3.1.152.9.15, 3.1.15
clerk clerk\/clerk-expo2.2.11 ≤ v < 2.19.362.19.36
clerk clerk\/clerk-js5.22.0 ≤ v < 5.125.10, 6.0.0 ≤ v < 6.7.55.125.10, 6.7.5
clerk clerk\/clerk-react5.9.0 ≤ v < 5.61.65.61.6
clerk clerk\/expo3.0.0 ≤ v < 3.2.23.2.2
clerk clerk\/express0.1.0 ≤ v < 1.7.79, 2.0.0 ≤ v < 2.1.61.7.79, 2.1.6
clerk clerk\/fastify1.0.42 ≤ v < 2.6.31, 3.0.0 ≤ v < 3.1.162.6.31, 3.1.16
clerk clerk\/hono0.0.2 ≤ v < 0.1.160.1.16
clerk clerk\/nextjs6.0.0 ≤ v ≤ 6.39.3, 7.0.0 ≤ v < 7.2.47.2.4
clerk clerk\/nuxt1.0.0 ≤ v < 1.13.29, 2.0.0 ≤ v < 2.2.51.13.29, 2.2.5
clerk clerk\/react6.0.0 ≤ v < 6.4.36.4.3
clerk clerk\/react-router0.0.1 ≤ v < 2.4.13, 3.0.0 ≤ v < 3.1.42.4.13, 3.1.4
clerk clerk\/shared3.0.0 ≤ v < 3.47.5, 4.0.0 ≤ v < 4.8.33.47.5, 4.8.3
clerk clerk\/tanstack-react-start0.0.1 ≤ v < 0.29.11, 1.0.0 ≤ v < 1.1.40.29.11, 1.1.4
clerk clerk\/vue1.0.0 ≤ v < 1.17.21, 2.0.0 ≤ v < 2.0.161.17.21, 2.0.16
@clerk/backendnpm2.0.0 ≤ v < 2.33.3, 3.0.0 ≤ v < 3.2.142.33.3, 3.2.14
@clerk/nextjsnpm6.0.0 ≤ v < 6.39.3, 7.0.0 ≤ v < 7.2.46.39.3, 7.2.4
@clerk/clerk-jsnpm5.22.0 ≤ v < 5.125.10, 6.0.0 ≤ v < 6.7.55.125.10, 6.7.5
@clerk/clerk-reactnpm5.9.0 ≤ v < 5.61.65.61.6
@clerk/reactnpm6.0.0 ≤ v < 6.4.36.4.3
@clerk/vuenpm1.0.0 ≤ v < 1.17.21, 2.0.0 ≤ v < 2.0.161.17.21, 2.0.16
@clerk/astronpm2.0.0 ≤ v < 2.17.11, 3.0.0 ≤ v < 3.0.182.17.11, 3.0.18
@clerk/nuxtnpm1.0.0 ≤ v < 1.13.29, 2.0.0 ≤ v < 2.2.51.13.29, 2.2.5
@clerk/clerk-exponpm2.2.11 ≤ v < 2.19.362.19.36
@clerk/exponpm3.0.0 ≤ v < 3.2.23.2.2
@clerk/react-routernpm0.0.1 ≤ v < 2.4.13, 3.0.0 ≤ v < 3.1.42.4.13, 3.1.4
@clerk/tanstack-react-startnpm0.0.1 ≤ v < 0.29.11, 1.0.0 ≤ v < 1.1.40.29.11, 1.1.4
@clerk/chrome-extensionnpm1.3.5 ≤ v < 2.9.15, 3.0.0 ≤ v < 3.1.152.9.15, 3.1.15
@clerk/fastifynpm1.0.42 ≤ v < 2.6.31, 3.0.0 ≤ v < 3.1.162.6.31, 3.1.16
@clerk/expressnpm0.1.0 ≤ v < 1.7.79, 2.0.0 ≤ v < 2.1.61.7.79, 2.1.6
@clerk/hononpm0.0.2 ≤ v < 0.1.160.1.16

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