CVE-2026-42349

What it is

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.

At a glance

Exploitability

Can be exploited over the network with a low-privilege account. High risk of data exposure, data tampering.

Exploit odds

0.2% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-05-11 17:16 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-10-26 18:10 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.2% in the next 30 days (EPSS).
• Severity: 7.6 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2026-05-11 17:16 UTC

Last modified

2026-10-26 18:10 UTC

Exploit probability

0.2% · EPSS, next 30 days

Weakness

CWE-754

Record status

Analyzed

Affected

• Clerk clerk\/astro < 2.17.11
• Clerk clerk\/astro < 3.0.18
• Clerk clerk\/backend < 2.33.3
• Clerk clerk\/backend < 3.2.14
• Clerk clerk\/chrome-extension < 2.9.15
• Clerk clerk\/chrome-extension < 3.1.15
• Clerk clerk\/clerk-expo < 2.19.36
• Clerk clerk\/clerk-js < 5.125.10

Attack profile CVSS 4.0 · 7.6

Attack vector

Network

Complexity

Low

Attack requirements

Present

Privileges needed

Low

User interaction

None

Confidentiality

High

Integrity

High

Availability

None

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2026-42349.md and follow it. Check whether this project is affected by CVE-2026-42349. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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