CVE-2025-13591 (GCVE-0-2025-13591)
Vulnerability from cvelistv5
Published
2026-10-19 16:45
Modified
2026-10-20 19:32
Severity ?
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE
  • CWE-203 - Information Exposure Through Discrepancy
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. Successful 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.
References
Impacted products
Vendor Product Version
WSO2 WSO2 Identity Server Version: 7.0.0   < 7.0.0.134
Version: 7.1.0   < 7.1.0.42
 Create a notification for this product.
   WSO2 WSO2 Carbon Abstract OTP Authenticator Version: 1.0.5   < 1.0.5.3
Version: 1.0.10   < 1.0.10.2
 Create a notification for this product.
   WSO2 Email OTP Authenticator Version: 1.0.18   < 1.0.18.8
Version: 1.0.30   < 1.0.30.5
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2025-13591",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-20T19:31:55.443304Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-20T19:32:03.360Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "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": "\u003cspan style=\"background-color: transparent;\"\u003eFollow the instructions given on \u003c/span\u003e\u003ca target=\"_blank\" rel=\"nofollow\" href=\"https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2025-4583/#solution\"\u003e\u003cspan style=\"background-color: transparent;\"\u003ehttps://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2025-4583/#solution\u003c/span\u003e\u003c/a\u003e \u003cbr\u003e"
            }
          ],
          "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": "2026-10-20T19:32:03.360Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.