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GHSA-9J2J-6WWH-JWF6

Vulnerability from github – Published: 2026-10-19 18:32 – Updated: 2026-10-19 18:32

Details

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.

Severity

5.3 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

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{
  "affected": [],
  "aliases": [
    "CVE-2025-13591"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-203"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-19T17:16:59Z",
    "severity": "MODERATE"
  },
  "details": "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.",
  "id": "GHSA-9j2j-6wwh-jwf6",
  "modified": "2026-10-19T18:32:13Z",
  "published": "2026-10-19T18:32:13Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-13591"
    },
    {
      "type": "WEB",
      "url": "https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2025-4583"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2025-13591 (GCVE-0-2025-13591)

Vulnerability from cvelistv5 – Published: 2026-10-19 16:45 – Updated: 2026-10-19 16:45

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. 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.

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

Assigner

WSO2 CNA under the mitre root

CNA scorecard B 89/100 over 48 records in the last 180 days details

References

1 reference

URL	Tags
https://security.docs.wso2.com/en/latest/security…	vendor-advisory

Impacted products

3 products

Vendor	Product	Version
WSO2	WSO2 Identity Server	Unknown: 0 , < 7.0.0 (custom) Affected: 7.0.0 , < 7.0.0.134 (custom) Affected: 7.1.0 , < 7.1.0.42 (custom) cpe:2.3:a:wso2:wso2_identity_server:::::::: cpe:2.3:a:wso2:wso2_identity_server::::::::
WSO2	WSO2 Carbon Abstract OTP Authenticator	Affected: 1.0.5 , < 1.0.5.3 (custom) Affected: 1.0.10 , < 1.0.10.2 (custom) cpe:2.3:a:wso2:wso2_carbon_abstract_otp_authenticator:::::::: cpe:2.3:a:wso2:wso2_carbon_abstract_otp_authenticator::::::::
WSO2	Email OTP Authenticator	Affected: 1.0.18 , < 1.0.18.8 (custom) Affected: 1.0.30 , < 1.0.30.5 (custom) cpe:2.3:a:wso2:email_otp_authenticator:::::::: cpe:2.3:a:wso2:email_otp_authenticator::::::::

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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