CVE-2026-41248

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under NVD CVSS v3. EPSS exploit probability: 0.1%, top 73% 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
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.1Exploit: 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. createRouteMatcher in @clerk/nextjs, @clerk/nuxt, and @clerk/astro can be bypassed by certain crafted requests, allowing them to skip middleware gating and reach downstream handlers. This vulnerability is fixed in @clerk/astro 1.5.7, 2.17.10, and 3.0.15; @clerk/nextjs 5.7.6, 6.39.2, and 7.2.1; @clerk/nuxt 1.13.28 and 2.2.2; and @clerk/shared 2.22.1, 3.47.4, anc 4.8.1

CVSS v3
9.1
EG Score
9.1(medium)
EPSS
24.2%
KEV
Not listed

Published

April 24, 2026

Last Modified

April 29, 2026

Advisory Details (1)

Auto-updated Apr 28, 2026
Patch available. Sources: github.
github Patch Available

Middleware-based route protection bypass · Advisory · clerk/javascript · GitHub

https://github.com/clerk/javascript/security/advisories/GHSA-vqx2-fgx2-5wq9

Affected Packages

(4 across 1 ecosystem)
npm(4)
PackageVulnerable rangeFixed inDependents
@clerk/astro—3.0.15—
@clerk/nextjs—7.2.1—
@clerk/nuxt—2.2.2—
@clerk/shared—4.8.1—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 40× 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.

Showing the most recent 100 of 135 total refreshes for this CVE.

  1. 2026-07-11 08:27 UTCEPSS rescore
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Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-41248?
CVE-2026-41248 is a critical vulnerability published on April 24, 2026. Clerk JavaScript is the official JavaScript repository for Clerk authentication. createRouteMatcher in @clerk/nextjs, @clerk/nuxt, and @clerk/astro can be bypassed by certain crafted requests, allowing them to skip middleware gating and reach downstream handlers. This vulnerability is fixed in…
When was CVE-2026-41248 disclosed?
CVE-2026-41248 was first published in the National Vulnerability Database on April 24, 2026, with the most recent update on April 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-41248 actively exploited?
CVE-2026-41248 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 24.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-41248?
CVE-2026-41248 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-41248?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-41248, 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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