CVE-2026-42349

Clerk: Authorization bypass when combining organization, billing, or reverification checks

State: Published
Severity: 7.6 High
Published: May 11, 2026
Updated: May 14, 2026
Reserved: Apr 26, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	7.6 High	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	GitHub_M

Weaknesses

CWE-754 Improper Check for Unusual or Exceptional Conditions
CWE-863 Incorrect Authorization

Affected Products

Product	Versions
javascriptclerk	>= 5.22.0, < 5.125.10Affected >= 6.0.0, < 6.7.5Affected
shared@clerk	>= 3.0.0, <= 3.47.4Affected >= 4.0.0, <= 4.8.2Affected
backend@clerk	>= 2.0.0, <= 2.33.2Affected >= 3.0.0, <= 3.2.13Affected
nextjs@clerk	>= 6.0.0, <= 6.39.2Affected >= 7.0.0, <= 7.2.3Affected
clerk-react@clerk	>= 5.9.0, <= 5.61.5Affected
react@clerk	>= 6.0.0, <= 6.4.2Affected
vue@clerk	>= 1.0.0, <= 1.17.20Affected >= 2.0.0, <= 2.0.15Affected
astro@clerk	>= 2.0.0, <= 2.17.10Affected >= 3.0.0, <= 3.0.17Affected
nuxt@clerk	>= 1.0.0, <= 1.13.28Affected >= 2.0.0, <= 2.2.4Affected
clerk-expo@clerk	>= 2.2.11, <= 2.19.35Affected
expo@clerk	>= 3.0.0, <= 3.2.1Affected
react-router@clerk	>= 0.0.1, <= 2.4.12Affected >= 3.0.0, <= 3.1.3Affected
tanstack-react-start@clerk	>= 0.0.1, <= 0.29.10Affected >= 1.0.0, <= 1.1.3Affected
chrome-extension@clerk	>= 1.3.5, <= 2.9.14Affected >= 3.0.0, <= 3.1.14Affected
fastify@clerk	>= 1.0.42, <= 2.6.30Affected >= 3.0.0, <= 3.1.15Affected
express@clerk	>= 0.1.0, <= 1.7.78Affected >= 2.0.0, <= 2.1.5Affected
hono@clerk	>= 0.0.2, <= 0.1.15Affected

References

https://github.com/clerk/javascript/security/advisories/GHSA-w24r-5266-9c3c

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