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    2 vulnerabilities found for x402 by x402-foundation

    CVE-2026-113603 (GCVE-0-2026-113603)

    Vulnerability from nvd – Published: 2026-10-20 15:40 – Updated: 2026-10-20 15:40
    VLAI
    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.
    Severity
    6.9 (Medium)
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
    6.5 (Medium)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
    CWE
    • CWE-639 - Authorization Bypass Through User-Controlled Key
    Assigner
    VulnCheck CNA under the mitre root
    CNA scorecard B 84/100 over 6614 records in the last 180 days details
    References
    Impacted products
    Date Public
    2026-10-17 12:38
    Credits
    CBF, Lza
    Show details on NVD website
    To clipboard 

    {
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:npm/%40x402/extensions",
          "product": "@x402/extensions",
          "repo": "https://github.com/x402-foundation/x402",
          "vendor": "x402-foundation",
          "versions": [
            {
              "lessThanOrEqual": "2.28.0",
              "status": "affected",
              "version": "2.3.1",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:pypi/x402",
          "product": "x402",
          "repo": "https://github.com/x402-foundation/x402",
          "vendor": "x402-foundation",
          "versions": [
            {
              "lessThanOrEqual": "2.25.0",
              "status": "affected",
              "version": "2.11.0",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:golang/github.com/x402-foundation/x402/go/v2",
          "product": "github.com/x402-foundation/x402/go/v2",
          "repo": "https://github.com/x402-foundation/x402",
          "vendor": "x402-foundation",
          "versions": [
            {
              "lessThanOrEqual": "2.28.0",
              "status": "affected",
              "version": "2.16.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "CBF, Lza"
        }
      ],
      "datePublic": "2026-10-17T12:38:29.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 6.9,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "LOW",
            "vulnIntegrityImpact": "LOW"
          },
          "format": "CVSS"
        },
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
            "version": "3.1"
          },
          "format": "CVSS"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
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              "description": "Authorization Bypass Through User-Controlled Key",
              "lang": "en",
              "type": "CWE"
            }
          ]
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-20T15:40:30.742Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck"
      },
      "references": [
        {
          "tags": [
            "issue-tracking"
          ],
          "url": "https://github.com/x402-foundation/x402/issues/3838"
        },
        {
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          ],
          "url": "https://github.com/x402-foundation/x402/pull/3840"
        },
        {
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          "url": "https://github.com/x402-foundation/x402/blob/npm-@x402/extensions@v2.28.0/typescript/packages/extensions/src/sign-in-with-x/hooks.ts"
        },
        {
          "tags": [
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          "url": "https://github.com/x402-foundation/x402/blob/pypi-x402@v2.25.0/python/x402/extensions/sign_in_with_x/hooks.py"
        },
        {
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          "url": "https://github.com/x402-foundation/x402/blob/go/v2.28.0/go/extensions/signinwithx/server.go"
        },
        {
          "name": "VulnCheck Advisory: x402 @x402/extensions 2.3.1 through 2.28.0 SIWX Payment Bypass via PaymentPayload.resource",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/x402-x402-extensions-2.3.1-through-2.28.0-siwx-payment-bypass-via-paymentpayload-resource"
        }
      ],
      "title": "x402 @x402/extensions 2.3.1 through 2.28.0 SIWX Payment Bypass via PaymentPayload.resource",
      "x_generator": {
        "engine": "vulncheck-endgame"
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    }
  },
  "cveMetadata": {
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    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-113603",
    "datePublished": "2026-10-20T15:40:30.742Z",
    "dateReserved": "2026-10-20T11:48:49.343Z",
    "dateUpdated": "2026-10-20T15:40:30.742Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2"
}

    CVE-2026-113603 (GCVE-0-2026-113603)

    Vulnerability from cvelistv5 – Published: 2026-10-20 15:40 – Updated: 2026-10-20 15:40
    VLAI
    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.
    Severity
    6.9 (Medium)
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
    6.5 (Medium)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
    CWE
    • CWE-639 - Authorization Bypass Through User-Controlled Key
    Assigner
    VulnCheck CNA under the mitre root
    CNA scorecard B 84/100 over 6614 records in the last 180 days details
    References
    Impacted products
    Date Public
    2026-10-17 12:38
    Credits
    CBF, Lza
    Show details on NVD website
    To clipboard 

    {
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:npm/%40x402/extensions",
          "product": "@x402/extensions",
          "repo": "https://github.com/x402-foundation/x402",
          "vendor": "x402-foundation",
          "versions": [
            {
              "lessThanOrEqual": "2.28.0",
              "status": "affected",
              "version": "2.3.1",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:pypi/x402",
          "product": "x402",
          "repo": "https://github.com/x402-foundation/x402",
          "vendor": "x402-foundation",
          "versions": [
            {
              "lessThanOrEqual": "2.25.0",
              "status": "affected",
              "version": "2.11.0",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:golang/github.com/x402-foundation/x402/go/v2",
          "product": "github.com/x402-foundation/x402/go/v2",
          "repo": "https://github.com/x402-foundation/x402",
          "vendor": "x402-foundation",
          "versions": [
            {
              "lessThanOrEqual": "2.28.0",
              "status": "affected",
              "version": "2.16.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "CBF, Lza"
        }
      ],
      "datePublic": "2026-10-17T12:38:29.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 6.9,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N",
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            "vulnConfidentialityImpact": "LOW",
            "vulnIntegrityImpact": "LOW"
          },
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        },
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
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          },
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      ],
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      ],
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          "url": "https://github.com/x402-foundation/x402/blob/npm-@x402/extensions@v2.28.0/typescript/packages/extensions/src/sign-in-with-x/hooks.ts"
        },
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          "tags": [
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          "url": "https://github.com/x402-foundation/x402/blob/pypi-x402@v2.25.0/python/x402/extensions/sign_in_with_x/hooks.py"
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      ],
      "title": "x402 @x402/extensions 2.3.1 through 2.28.0 SIWX Payment Bypass via PaymentPayload.resource",
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