FKIE_CVE-2026-41248
Vulnerability from fkie_nvd - Published: 2026-04-24 21:16 - Updated: 2026-06-17 10:46
Severity
Summary
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
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"product": "astro",
"vendor": "clerk",
"versions": [
{
"status": "affected",
"version": "\u003e= 0.0.1, \u003c 1.5.7"
},
{
"status": "affected",
"version": "\u003e= 2.0.0-snapshot.v20241206174604, \u003c= 2.17.9"
},
{
"status": "affected",
"version": "\u003e= 3.0.0, \u003c 3.0.15"
}
]
},
{
"product": "nextjs",
"vendor": "clerk",
"versions": [
{
"status": "affected",
"version": "\u003e= 5.0.0, \u003c 5.7.6"
},
{
"status": "affected",
"version": "\u003e= 6.0.0-snapshot.vb87a27f, \u003c 6.39.2"
},
{
"status": "affected",
"version": "\u003e= 7.0.0, \u003c 7.2.1"
}
]
},
{
"product": "nuxt",
"vendor": "clerk",
"versions": [
{
"status": "affected",
"version": "\u003e= 1.1.0, \u003c 1.13.28"
},
{
"status": "affected",
"version": "\u003e= 2.0.0, \u003c 2.2.2"
}
]
},
{
"product": "shared",
"vendor": "clerk",
"versions": [
{
"status": "affected",
"version": "\u003e= 2.20.17, \u003c 2.22.1"
},
{
"status": "affected",
"version": "\u003e= 3.0.0-canary.v20250225091530, \u003c 3.47.4"
},
{
"status": "affected",
"version": "\u003e= 4.0.0, \u003c 4.8.1"
}
]
}
],
"source": "security-advisories@github.com"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "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"
}
],
"id": "CVE-2026-41248",
"lastModified": "2026-06-17T10:46:23.023",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 9.1,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 5.2,
"source": "security-advisories@github.com",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-41248",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-04-27T13:46:14.373183Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-04-24T21:16:18.497",
"references": [
{
"source": "security-advisories@github.com",
"url": "https://github.com/clerk/javascript/security/advisories/GHSA-vqx2-fgx2-5wq9"
}
],
"sourceIdentifier": "security-advisories@github.com",
"vulnStatus": "Deferred",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-436"
},
{
"lang": "en",
"value": "CWE-863"
}
],
"source": "security-advisories@github.com",
"type": "Secondary"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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