VulnerabilityAnalyzed

CVE-2026-42349

HIGH 7.6EPSS 0.25%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (0.25%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

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.

CVSS 4.0: 7.6 HIGHCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
EPSS: 0.25% probability · 16th percentile
CISA KEV: Not listed
Weakness: CWE-754, CWE-863
Affected: clerk/clerk\/astro · clerk/clerk\/backend · clerk/clerk\/chrome-extension · clerk/clerk\/clerk-expo · clerk/clerk\/clerk-js · clerk/clerk\/clerk-react · clerk/clerk\/expo · clerk/clerk\/express · clerk/clerk\/fastify · clerk/clerk\/hono · clerk/clerk\/nextjs · clerk/clerk\/nuxt · clerk/clerk\/react · clerk/clerk\/react-router · clerk/clerk\/shared · clerk/clerk\/tanstack-react-start · clerk/clerk\/vue
Source: security-advisories@github.com

References

https://github.com/clerk/javascript/security/advisories/GHSA-w24r-5266-9c3cMitigation, Vendor Advisory
https://github.com/clerk/javascript/security/advisories/GHSA-w24r-5266-9c3cMitigation, Vendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.