CVE-2026-42349

HIGHNVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.1 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 84% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
8.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.1Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
8.1
EG Score
8.1(medium)
EG Risk
52(Track)
EG Risk 52/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity81% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
15.9%
KEV
Not listed

Published

May 11, 2026

Last Modified

June 1, 2026

Advisory Details (1)

Auto-updated May 11, 2026
Patch available. Sources: github.
github Patch Available

Authorization bypass when combining organization, billing, or reverification checks · Advisory · clerk/javascript · GitHub

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

Vendor Advisories for CVE-2026-42349(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(17 across 1 ecosystem)
npm(17)
PackageVulnerable rangeFixed inDependents
@clerk/astro—3.0.18—
@clerk/backend—3.2.14—
@clerk/chrome-extension—3.1.15—
@clerk/clerk-expo—2.19.36—
@clerk/clerk-js—6.7.5—
@clerk/clerk-react—5.61.6—
@clerk/expo—3.2.2—
@clerk/express—2.1.6—
@clerk/fastify—3.1.16—
@clerk/hono—0.1.16—
@clerk/nextjs—7.2.4—
@clerk/nuxt—2.2.5—
@clerk/react—6.4.3—
@clerk/react-router—3.1.4—
@clerk/shared—4.8.3—
@clerk/tanstack-react-start—1.1.4—
@clerk/vue—2.0.16—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 34× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-23 03:11 UTCEG score recompute
  2. 2026-07-22 14:08 UTCEPSS rescore
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  1. 2026-06-30 23:22 UTCEPSS rescore
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  39. 2026-06-01 19:49 UTCEG score recompute▲ 0.50
  40. 2026-06-01 13:52 UTCEPSS rescore
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  59. 2026-05-20 13:16 UTCEG score recompute
  60. 2026-05-20 11:22 UTCEPSS rescore
  61. 2026-05-20 11:22 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-42349?
CVE-2026-42349 is a high vulnerability published on May 11, 2026. 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…
When was CVE-2026-42349 disclosed?
CVE-2026-42349 was first published in the National Vulnerability Database on May 11, 2026, with the most recent update on June 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42349 actively exploited?
CVE-2026-42349 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 15.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-42349?
CVE-2026-42349 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-42349?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42349, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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