{
  "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-2025-13591",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2025-13591",
    "idYear": 2025,
    "status": "PUBLISHED",
    "publishedAt": "2026-10-19T16:45:59.519Z",
    "updatedAt": "2026-10-20T19:32:03.360Z",
    "importedAt": "2026-10-24T01:57:24.991Z",
    "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": "Username Enumeration via Authentication Endpoint in WSO2 Identity Server Allows User Account Discovery",
      "summary": "The authentication endpoint of WSO2 Identity Server fails to provide a consistent system response when a username does not exist in the system, allowing attackers to differentiate between valid and invalid usernames. This difference in responses can be leveraged to enumerate existing user accounts.\n\nSuccessful exploitation enables an attacker to discover valid usernames within the system, significantly increasing the risk of subsequent attacks such as brute force attacks on user credentials, social engineering attacks, and information leakage. The discovered usernames can be used to craft targeted phishing emails or other social engineering campaigns.",
      "affected": [
        {
          "vendor": "WSO2",
          "product": "WSO2 Identity Server",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "0",
              "status": "unknown",
              "versionType": "custom",
              "lessThan": "7.0.0"
            },
            {
              "version": "7.0.0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "7.0.0.134"
            },
            {
              "version": "7.1.0",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "7.1.0.42"
            }
          ]
        },
        {
          "vendor": "WSO2",
          "product": "WSO2 Carbon Abstract OTP Authenticator",
          "packageName": "org.wso2.carbon.identity.auth.otp.commons:org.wso2.carbon.identity.auth.otp.core",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "1.0.5",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "1.0.5.3"
            },
            {
              "version": "1.0.10",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "1.0.10.2"
            }
          ]
        },
        {
          "vendor": "WSO2",
          "product": "Email OTP Authenticator",
          "packageName": "org.wso2.carbon.identity.local.auth.emailotp:org.wso2.carbon.identity.local.auth.emailotp",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "1.0.18",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "1.0.18.8"
            },
            {
              "version": "1.0.30",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "1.0.30.5"
            }
          ]
        }
      ]
    }
  }
}