{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2026-113603",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-113603",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-10-20T15:40:30.742Z",
    "updatedAt": "2026-10-21T15:54:28.895Z",
    "importedAt": "2026-10-24T01:57:50.502Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "x402 @x402/extensions 2.3.1 through 2.28.0 SIWX Payment Bypass via PaymentPayload.resource",
      "summary": "The x402 SIWX server extension in @x402/extensions 2.3.1 through 2.28.0, x402 PyPI 2.11.0 through 2.25.0, and Go module 2.16.0 through 2.28.0 contains an authorization bypass vulnerability that allows paying clients to unlock unpaid routes by supplying a mismatched PaymentPayload.resource URL. Attackers can pay for the cheapest SIWX-protected route while setting resource.url to an expensive route, then repeatedly access it using only a SIGN-IN-WITH-X header without further payment.",
      "affected": [
        {
          "vendor": "x402-foundation",
          "product": "@x402/extensions",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "2.3.1",
              "status": "affected",
              "versionType": "semver",
              "lessThanOrEqual": "2.28.0"
            }
          ]
        },
        {
          "vendor": "x402-foundation",
          "product": "x402",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "2.11.0",
              "status": "affected",
              "versionType": "semver",
              "lessThanOrEqual": "2.25.0"
            }
          ]
        },
        {
          "vendor": "x402-foundation",
          "product": "github.com/x402-foundation/x402/go/v2",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "2.16.0",
              "status": "affected",
              "versionType": "semver",
              "lessThanOrEqual": "2.28.0"
            }
          ]
        }
      ]
    }
  }
}