{"api_version":"1","generated_at":"2026-10-19T21:55:58+00:00","cve":"CVE-2025-13591","urls":{"html":"https://cve.report/CVE-2025-13591","api":"https://cve.report/api/cve/CVE-2025-13591.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2025-13591","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2025-13591"},"summary":{"title":"Username Enumeration via Authentication Endpoint in WSO2 Identity Server Allows User Account Discovery","description":"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.","state":"PUBLISHED","assigner":"WSO2","published_at":"2026-10-19 17:16:59","updated_at":"2026-10-19 21:06:28"},"problem_types":["CWE-203","CWE-203 CWE-203: Information Exposure Through Discrepancy"],"metrics":[{"version":"3.1","source":"ed10eef1-636d-4fbe-9993-6890dfa878f8","type":"Secondary","score":"5.3","severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","baseScore":5.3,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"NONE","availabilityImpact":"NONE"}},{"version":"3.1","source":"CNA","type":"CVSS","score":"5.3","severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","data":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","version":"3.1"}}],"references":[{"url":"https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2025-4583/","name":"https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2025-4583/","refsource":"ed10eef1-636d-4fbe-9993-6890dfa878f8","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-13591","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-13591","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"WSO2","product":"WSO2 Identity Server","version":"unknown 7.0.0 custom","platforms":[]},{"source":"CNA","vendor":"WSO2","product":"WSO2 Identity Server","version":"affected 7.0.0 7.0.0.134 custom","platforms":[]},{"source":"CNA","vendor":"WSO2","product":"WSO2 Identity Server","version":"affected 7.1.0 7.1.0.42 custom","platforms":[]},{"source":"CNA","vendor":"WSO2","product":"WSO2 Carbon Abstract OTP Authenticator","version":"affected 1.0.5 1.0.5.3 custom","platforms":[]},{"source":"CNA","vendor":"WSO2","product":"WSO2 Carbon Abstract OTP Authenticator","version":"affected 1.0.10 1.0.10.2 custom","platforms":[]},{"source":"CNA","vendor":"WSO2","product":"Email OTP Authenticator","version":"affected 1.0.18 1.0.18.8 custom","platforms":[]},{"source":"CNA","vendor":"WSO2","product":"Email OTP Authenticator","version":"affected 1.0.30 1.0.30.5 custom","platforms":[]}],"timeline":[],"solutions":[{"source":"CNA","title":"","value":"Follow the instructions given on https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2025-4583/#solution","time":"","lang":"en"}],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"WSO2 Identity Server","vendor":"WSO2","versions":[{"lessThan":"7.0.0","status":"unknown","version":"0","versionType":"custom"},{"lessThan":"7.0.0.134","status":"affected","version":"7.0.0","versionType":"custom"},{"lessThan":"7.1.0.42","status":"affected","version":"7.1.0","versionType":"custom"}]},{"defaultStatus":"unknown","packageName":"org.wso2.carbon.identity.auth.otp.commons:org.wso2.carbon.identity.auth.otp.core","product":"WSO2 Carbon Abstract OTP Authenticator","vendor":"WSO2","versions":[{"lessThan":"1.0.5.3","status":"affected","version":"1.0.5","versionType":"custom"},{"lessThan":"1.0.10.2","status":"affected","version":"1.0.10","versionType":"custom"}]},{"defaultStatus":"unknown","packageName":"org.wso2.carbon.identity.local.auth.emailotp:org.wso2.carbon.identity.local.auth.emailotp","product":"Email OTP Authenticator","vendor":"WSO2","versions":[{"lessThan":"1.0.18.8","status":"affected","version":"1.0.18","versionType":"custom"},{"lessThan":"1.0.30.5","status":"affected","version":"1.0.30","versionType":"custom"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:a:wso2:wso2_identity_server:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.0.134","versionStartIncluding":"7.0.0","vulnerable":true},{"criteria":"cpe:2.3:a:wso2:wso2_identity_server:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.0.42","versionStartIncluding":"7.1.0","vulnerable":true}],"negate":false,"operator":"OR"},{"cpeMatch":[{"criteria":"cpe:2.3:a:wso2:wso2_carbon_abstract_otp_authenticator:*:*:*:*:*:*:*:*","versionEndExcluding":"1.0.5.3","versionStartIncluding":"1.0.5","vulnerable":true},{"criteria":"cpe:2.3:a:wso2:wso2_carbon_abstract_otp_authenticator:*:*:*:*:*:*:*:*","versionEndExcluding":"1.0.10.2","versionStartIncluding":"1.0.10","vulnerable":true}],"negate":false,"operator":"OR"},{"cpeMatch":[{"criteria":"cpe:2.3:a:wso2:email_otp_authenticator:*:*:*:*:*:*:*:*","versionEndExcluding":"1.0.18.8","versionStartIncluding":"1.0.18","vulnerable":true},{"criteria":"cpe:2.3:a:wso2:email_otp_authenticator:*:*:*:*:*:*:*:*","versionEndExcluding":"1.0.30.5","versionStartIncluding":"1.0.30","vulnerable":true}],"negate":false,"operator":"OR"}],"operator":"OR"}],"descriptions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"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."}],"value":"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."}],"impacts":[{"capecId":"CAPEC-274","descriptions":[{"lang":"en","value":"CAPEC-274 CAPEC-274: Username Enumeration"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","version":"3.1"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-203","description":"CWE-203: Information Exposure Through Discrepancy","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-10-19T16:45:59.519Z","orgId":"ed10eef1-636d-4fbe-9993-6890dfa878f8","shortName":"WSO2"},"references":[{"tags":["vendor-advisory"],"url":"https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2025-4583/"}],"solutions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"<span style=\"background-color: transparent;\">Follow the instructions given on </span><a target=\"_blank\" rel=\"nofollow\" href=\"https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2025-4583/#solution\"><span style=\"background-color: transparent;\">https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2025-4583/#solution</span></a> <br>"}],"value":"Follow the instructions given on https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2025-4583/#solution"}],"source":{"advisory":"WSO2-2025-4583","discovery":"INTERNAL"},"title":"Username Enumeration via Authentication Endpoint in WSO2 Identity Server Allows User Account Discovery","x_generator":{"engine":"Vulnogram 0.2.0"}}},"cveMetadata":{"assignerOrgId":"ed10eef1-636d-4fbe-9993-6890dfa878f8","assignerShortName":"WSO2","cveId":"CVE-2025-13591","datePublished":"2026-10-19T16:45:59.519Z","dateReserved":"2025-11-24T05:16:09.553Z","dateUpdated":"2026-10-19T16:45:59.519Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-19 17:16:59","lastModifiedDate":"2026-10-19 21:06:28","problem_types":["CWE-203","CWE-203 CWE-203: Information Exposure Through Discrepancy"],"metrics":{"cvssMetricV31":[{"source":"ed10eef1-636d-4fbe-9993-6890dfa878f8","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","baseScore":5.3,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"NONE","availabilityImpact":"NONE"},"exploitabilityScore":3.9,"impactScore":1.4}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2025","CveId":"13591","Ordinal":"1","Title":"Username Enumeration via Authentication Endpoint in WSO2 Identit","CVE":"CVE-2025-13591","Year":"2025"},"notes":[{"CveYear":"2025","CveId":"13591","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"Username Enumeration via Authentication Endpoint in WSO2 Identit"}]}}}