CVE-2026-42349

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

HIGH

8.1

CVSS Score

Published: May 11, 2026 at 04:08 PM UTC

Updated: October 26, 2026 at 06:10 PM UTC

18 products affected across 1 vendorClerk /astroClerk /sharedClerk /nextjs

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Severity

HIGH8.1

Exploit prediction

EPSS 0.2%

SSVC

PoC

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Clerk /astro · Clerk

95%

2.0.0 ≤ v < 2.17.113.0.0 ≤ v < 3.0.18

Affected range stops below 2.17.11, so it looks safe — our inference, not a vendor statement

Affected range stops below 3.0.18, so it looks safe — our inference, not a vendor statement

Clerk /backend · Clerk

95%

2.0.0 ≤ v < 2.33.33.0.0 ≤ v < 3.2.14

Affected range stops below 2.33.3, so it looks safe — our inference, not a vendor statement

Affected range stops below 3.2.14, so it looks safe — our inference, not a vendor statement

Clerk /chrome Extension · Clerk

95%

1.3.5 ≤ v < 2.9.153.0.0 ≤ v < 3.1.15

Affected range stops below 2.9.15, so it looks safe — our inference, not a vendor statement

Affected range stops below 3.1.15, so it looks safe — our inference, not a vendor statement

Clerk /clerk Expo · Clerk

95%

2.2.11 ≤ v < 2.19.36

Affected range stops below 2.19.36, so it looks safe — our inference, not a vendor statement

Clerk /clerk Js · Clerk

95%

5.22.0 ≤ v < 5.125.106.0.0 ≤ v < 6.7.5

Affected range stops below 5.125.10, so it looks safe — our inference, not a vendor statement

Affected range stops below 6.7.5, so it looks safe — our inference, not a vendor statement

Clerk /clerk React · Clerk

95%

5.9.0 ≤ v < 5.61.6

Affected range stops below 5.61.6, so it looks safe — our inference, not a vendor statement

Clerk Expo · Clerk

95%

3.0.0 ≤ v < 3.2.2

Affected range stops below 3.2.2, so it looks safe — our inference, not a vendor statement

Clerk /express · Clerk

95%

0.1.0 ≤ v < 1.7.792.0.0 ≤ v < 2.1.6

Affected range stops below 1.7.79, so it looks safe — our inference, not a vendor statement

Affected range stops below 2.1.6, so it looks safe — our inference, not a vendor statement

Clerk /fastify · Clerk

95%

1.0.42 ≤ v < 2.6.313.0.0 ≤ v < 3.1.16

Affected range stops below 2.6.31, so it looks safe — our inference, not a vendor statement

Affected range stops below 3.1.16, so it looks safe — our inference, not a vendor statement

Clerk /hono · Clerk

95%

0.0.2 ≤ v < 0.1.16

Affected range stops below 0.1.16, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

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

References (1)

x_refsource_CONFIRMMitigationVendor Advisory

Source: cverecord

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

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.1HIGH[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: LOW
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: NONE

Vector?

Quick Info

StatusANALYZED

CWE

CWE-754CWE-863

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