Vulnerability-Lookup

FKIE_CVE-2026-41248

Vulnerability from fkie_nvd - Published: 2026-04-24 21:16 - Updated: 2026-04-24 21:16

Severity ?

9.1 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

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

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

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "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": "2026-04-24T21:16:18.497",
  "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"
      }
    ]
  },
  "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": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-436"
        },
        {
          "lang": "en",
          "value": "CWE-863"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}

CVE-2026-41248 (GCVE-0-2026-41248)

Vulnerability from cvelistv5 – Published: 2026-04-24 21:04 – Updated: 2026-04-24 21:04

Title

Official Clerk JavaScript SDKs: Middleware-based route protection bypass

Summary

Severity ?

9.1 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CWE

CWE-436 - Interpretation Conflict
CWE-863 - Incorrect Authorization

Assigner

GitHub_M

References

URL

Tags

https://github.com/clerk/javascript/security/advi…

x_refsource_CONFIRM

Impacted products

Vendor

Product

Version

clerk

astro

Affected: >= 0.0.1, < 1.5.7
Affected: >= 2.0.0-snapshot.v20241206174604, <= 2.17.9
Affected: >= 3.0.0, < 3.0.15

clerk	nextjs	Affected: >= 5.0.0, < 5.7.6 Affected: >= 6.0.0-snapshot.vb87a27f, < 6.39.2 Affected: >= 7.0.0, < 7.2.1
clerk	nuxt	Affected: >= 1.1.0, < 1.13.28 Affected: >= 2.0.0, < 2.2.2
clerk	shared	Affected: >= 2.20.17, < 2.22.1 Affected: >= 3.0.0-canary.v20250225091530, < 3.47.4 Affected: >= 4.0.0, < 4.8.1

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "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"
            }
          ]
        }
      ],
      "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"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "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"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-436",
              "description": "CWE-436: Interpretation Conflict",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-863",
              "description": "CWE-863: Incorrect Authorization",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-24T21:04:35.810Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/clerk/javascript/security/advisories/GHSA-vqx2-fgx2-5wq9",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/clerk/javascript/security/advisories/GHSA-vqx2-fgx2-5wq9"
        }
      ],
      "source": {
        "advisory": "GHSA-vqx2-fgx2-5wq9",
        "discovery": "UNKNOWN"
      },
      "title": "Official Clerk JavaScript SDKs:  Middleware-based route protection bypass"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-41248",
    "datePublished": "2026-04-24T21:04:35.810Z",
    "dateReserved": "2026-04-18T03:47:03.136Z",
    "dateUpdated": "2026-04-24T21:04:35.810Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

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.

Detection rules are retrieved from Rulezet.

Action not permitted

FKIE_CVE-2026-41248

CVE-2026-41248 (GCVE-0-2026-41248)

Tags

Sightings

Nomenclature