{
  "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-2026-3416",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-3416",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-09-03T12:35:32.628Z",
    "updatedAt": "2026-09-03T12:55:15.634Z",
    "importedAt": "2026-10-24T01:58:08.712Z",
    "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": "Predictable Pseudorandom Number Generation via Webhook HMAC Secret Generation in Multiple WSO2 Products Allows Forged Event Payloads",
      "summary": "The API Publisher component previously used a non-cryptographic pseudorandom number generator (PRNG) to create shared secrets for Webhook HMAC validation. This PRNG lacks sufficient entropy for security-sensitive operations, allowing a sophisticated attacker to predict future secrets. This enables malicious actors to forge event payloads with valid HMAC signatures, bypassing the API Gateway's authenticity verification.\n\nSuccessful exploitation could allow an attacker to predict shared secrets used for Webhook HMAC validation and forge event payloads with valid signatures. This may enable bypassing API Gateway authenticity checks, leading to unauthorized event injection, data manipulation, or downstream system compromise.",
      "affected": [
        {
          "vendor": "WSO2",
          "product": "WSO2 API Manager",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "0",
              "status": "unknown",
              "versionType": "custom",
              "lessThan": "4.1.0"
            },
            {
              "version": "4.1.0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "4.1.0.253"
            },
            {
              "version": "4.2.0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "4.2.0.193"
            },
            {
              "version": "4.3.0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "4.3.0.104"
            },
            {
              "version": "4.4.0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "4.4.0.68"
            },
            {
              "version": "4.5.0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "4.5.0.52"
            }
          ]
        },
        {
          "vendor": "WSO2",
          "product": "WSO2 API Control Plane",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "4.5.0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "4.5.0.53"
            }
          ]
        }
      ]
    }
  }
}