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High, CVSS 7.6amended

Clerk has an authorization bypass when combining organization, billing, or reverification checks

CVE-2026-42349GHSA-w24r-5266-9c3c

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (@clerk/expo 3.2.2; @clerk/react 6.4.3; @clerk/fastify 3.1.16, 2.6.31; @clerk/express 2.1.6, 1.7.79; @clerk/nuxt 2.2.5, 1.13.29; 12 more packages under Affected packages), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • npm @clerk/expo

    Affected
    >= 3.0.0, <= 3.2.1
    Fixed in
    3.2.2

  • npm @clerk/react

    Affected
    >= 6.0.0, <= 6.4.2
    Fixed in
    6.4.3

  • npm @clerk/fastify

    Affected
    >= 1.0.42, <= 2.6.30>= 3.0.0, <= 3.1.15
    Fixed in
    3.1.16, 2.6.31

  • npm @clerk/express

    Affected
    >= 0.1.0, <= 1.7.78>= 2.0.0, <= 2.1.5
    Fixed in
    1.7.79, 2.1.6

  • npm @clerk/nuxt

    Affected
    >= 1.0.0, <= 1.13.28>= 2.0.0, <= 2.2.4
    Fixed in
    1.13.29, 2.2.5

  • npm @clerk/astro

    Affected
    >= 2.0.0, <= 2.17.10>= 3.0.0, <= 3.0.17
    Fixed in
    3.0.18, 2.17.11

  • npm @clerk/backend

    Affected
    >= 2.0.0, <= 2.33.2>= 3.0.0, <= 3.2.13
    Fixed in
    2.33.3, 3.2.14

  • npm @clerk/nextjs

    Affected
    >= 6.0.0, <= 6.39.2>= 7.0.0, <= 7.2.3
    Fixed in
    6.39.3, 7.2.4

  • npm @clerk/clerk-react

    Affected
    >= 5.9.0, <= 5.61.5
    Fixed in
    5.61.6

  • npm @clerk/chrome-extension

    Affected
    >= 1.3.5, <= 2.9.14>= 3.0.0, <= 3.1.14
    Fixed in
    2.9.15, 3.1.15

  • npm @clerk/clerk-js

    Affected
    >= 5.22.0, <= 5.125.9>= 6.0.0, <= 6.7.4
    Fixed in
    5.125.10, 6.7.5

  • npm @clerk/tanstack-react-start

    Affected
    >= 0.0.1, <= 0.29.10>= 1.0.0, <= 1.1.3
    Fixed in
    0.29.11, 1.1.4

  • npm @clerk/hono

    Affected
    >= 0.0.2, <= 0.1.15
    Fixed in
    0.1.16

  • npm @clerk/vue

    Affected
    >= 1.0.0, <= 1.17.20>= 2.0.0, <= 2.0.15
    Fixed in
    1.17.21, 2.0.16

  • npm @clerk/react-router

    Affected
    >= 0.0.1, <= 2.4.12>= 3.0.0, <= 3.1.3
    Fixed in
    2.4.13, 3.1.4

  • npm @clerk/shared

    Affected
    >= 3.0.0, <= 3.47.4>= 4.0.0, <= 4.8.2
    Fixed in
    4.8.3, 3.47.5

  • npm @clerk/clerk-expo

    Affected
    >= 2.2.11, <= 2.19.35
    Fixed in
    2.19.36

Sources

  • Open Source Vulnerabilities (OSV.dev), including the GitHub Advisory Database

    OSV record GHSA-w24r-5266-9c3c lists affected ranges: npm @clerk/shared >=3.0.0 =4.0.0 =2.0.0 =3.0.0 =6.0.0 =7.0.0 =5.22.0 =6.0.0 =5.9.0 =6.0.0 =1.0.0 =2.0.0 <2.0.16 (fixed); npm…

    VerifiedObserved Structured OSV record; GitHub-reviewed advisory.

  • GitHub Advisory Database and maintainer security advisories on GitHub

    GitHub-reviewed advisory GHSA-w24r-5266-9c3c lists affected ranges: npm @clerk/shared >=3.0.0 =4.0.0 =2.0.0 =3.0.0 =6.0.0 =7.0.0 =5.22.0 =6.0.0 =5.9.0 =6.0.0 =1.0.0 =2.0.0 =2.0.0 =3.0.0 =1.0.0…

    VerifiedObserved Structured GitHub Advisory Database record (type=reviewed) from the GitHub REST API.

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
7.6 · 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 · score source
EPSS
  • CVE-2026-42349: 0.25% estimated exploitation activity in the next 30 days; percentile 15.91 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Summary 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. Sessions are not compromised and no existing user can be impersonated. The bypass is limited to the authorization decision returned by the predicate. clerkMiddleware continues to authenticate requests correctly, auth() reflects the real authentication state, and token verification is unaffected. Who is affected All apps that combine more than one authorization dimension in a single has() or auth.protect() call should upgrade to the patched versions. Patches are drop-in with no API changes. The information below describes the scope of the bypass and helps developers understand whether their apps are potentially affected, but is not a reason to delay the…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from ghsa record GHSA-w24r-5266-9c3c

  2. Revision 2 · amended ·

    Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

  3. Revision 1 · created ·

    Published from osv record GHSA-w24r-5266-9c3c

Agent brief

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# Patch Next advisory brief: CVE-2026-42349

Advisory: Clerk has an authorization bypass when combining organization, billing, or reverification checks
IDs: CVE-2026-42349, GHSA-w24r-5266-9c3c
Record: https://patchnext.com/advisories/cve-2026-42349 (revision 3, source checked 26 Oct 2026, 12:53 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.6)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: @clerk/expo 3.2.2; @clerk/react 6.4.3; @clerk/fastify 3.1.16, 2.6.31; @clerk/express 2.1.6, 1.7.79; @clerk/nuxt 2.2.5, 1.13.29; @clerk/astro 3.0.18, 2.17.11; @clerk/backend 3.2.14, 2.33.3; @clerk/nextjs 7.2.4, 6.39.3; @clerk/clerk-react 5.61.6; @clerk/chrome-extension 3.1.15, 2.9.15; @clerk/clerk-js 6.7.5, 5.125.10; @clerk/tanstack-react-start 1.1.4, 0.29.11; @clerk/hono 0.1.16; @clerk/vue 2.0.16, 1.17.21; @clerk/react-router 3.1.4, 2.4.13; @clerk/shared 4.8.3, 3.47.5; @clerk/clerk-expo 2.19.36. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @clerk/expo: affected >= 3.0.0, <= 3.2.1; fixed in 3.2.2
- npm @clerk/react: affected >= 6.0.0, <= 6.4.2; fixed in 6.4.3
- npm @clerk/fastify: affected >= 1.0.42, <= 2.6.30; >= 3.0.0, <= 3.1.15; fixed in 3.1.16, 2.6.31
- npm @clerk/express: affected >= 0.1.0, <= 1.7.78; >= 2.0.0, <= 2.1.5; fixed in 1.7.79, 2.1.6
- npm @clerk/nuxt: affected >= 1.0.0, <= 1.13.28; >= 2.0.0, <= 2.2.4; fixed in 1.13.29, 2.2.5
- npm @clerk/astro: affected >= 2.0.0, <= 2.17.10; >= 3.0.0, <= 3.0.17; fixed in 3.0.18, 2.17.11
- npm @clerk/backend: affected >= 2.0.0, <= 2.33.2; >= 3.0.0, <= 3.2.13; fixed in 2.33.3, 3.2.14
- npm @clerk/nextjs: affected >= 6.0.0, <= 6.39.2; >= 7.0.0, <= 7.2.3; fixed in 6.39.3, 7.2.4
- npm @clerk/clerk-react: affected >= 5.9.0, <= 5.61.5; fixed in 5.61.6
- npm @clerk/chrome-extension: affected >= 1.3.5, <= 2.9.14; >= 3.0.0, <= 3.1.14; fixed in 2.9.15, 3.1.15
- npm @clerk/clerk-js: affected >= 5.22.0, <= 5.125.9; >= 6.0.0, <= 6.7.4; fixed in 5.125.10, 6.7.5
- npm @clerk/tanstack-react-start: affected >= 0.0.1, <= 0.29.10; >= 1.0.0, <= 1.1.3; fixed in 0.29.11, 1.1.4
- npm @clerk/hono: affected >= 0.0.2, <= 0.1.15; fixed in 0.1.16
- npm @clerk/vue: affected >= 1.0.0, <= 1.17.20; >= 2.0.0, <= 2.0.15; fixed in 1.17.21, 2.0.16
- npm @clerk/react-router: affected >= 0.0.1, <= 2.4.12; >= 3.0.0, <= 3.1.3; fixed in 2.4.13, 3.1.4
- npm @clerk/shared: affected >= 3.0.0, <= 3.47.4; >= 4.0.0, <= 4.8.2; fixed in 4.8.3, 3.47.5
- npm @clerk/clerk-expo: affected >= 2.2.11, <= 2.19.35; fixed in 2.19.36

## Suggested inspection (read-only)
- `npm ls @clerk/expo --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.
- `npm ls @clerk/react --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.
- `npm ls @clerk/fastify --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.
- `npm ls @clerk/express --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.
- `npm ls @clerk/nuxt --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.
- `npm ls @clerk/astro --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.
- `npm ls @clerk/backend --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.
- `npm ls @clerk/nextjs --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.
- `npm ls @clerk/clerk-react --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.
- `npm ls @clerk/chrome-extension --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.
- `npm ls @clerk/clerk-js --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.
- `npm ls @clerk/tanstack-react-start --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.
- `npm ls @clerk/hono --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.
- `npm ls @clerk/vue --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.
- `npm ls @clerk/react-router --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.
- `npm ls @clerk/shared --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.
- `npm ls @clerk/clerk-expo --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on @clerk/expo, @clerk/react, @clerk/fastify, @clerk/express, @clerk/nuxt, @clerk/astro, @clerk/backend, @clerk/nextjs, @clerk/clerk-react, @clerk/chrome-extension, @clerk/clerk-js, @clerk/tanstack-react-start, @clerk/hono, @clerk/vue, @clerk/react-router, @clerk/shared, @clerk/clerk-expo.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-w24r-5266-9c3c (OSV record GHSA-w24r-5266-9c3c lists affected ranges: npm @clerk/shared >=3.0.0 =4.0.0 =2.0.0 =3.0.0 =6.0.0 =7.0.0 =5.22.0 =6.0.0 =5.9.0 =6.0.0 =1.0.0 =2.0.0 <2.0.16 (fixed); npm…)
- Verified: https://github.com/advisories/GHSA-w24r-5266-9c3c (GitHub-reviewed advisory GHSA-w24r-5266-9c3c lists affected ranges: npm @clerk/shared >=3.0.0 =4.0.0 =2.0.0 =3.0.0 =6.0.0 =7.0.0 =5.22.0 =6.0.0 =5.9.0 =6.0.0 =1.0.0 =2.0.0 =2.0.0 =3.0.0 =1.0.0…)

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