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CVE-2025-13591

5.3 medium SSVC exploitation: none Published
NVD · CVE.org

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.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 5

  1. StatusAwaiting Analysis → PublishedNVD modified 2026-10-20 19:32
  2. StatusPublished → Awaiting AnalysisNVD modified 2026-10-20 20:17
  3. StatusAwaiting Analysis → PublishedNVD modified 2026-10-19 16:45
  4. StatusReceived → Awaiting AnalysisNVD modified 2026-10-19 21:06
  5. First seenCVSS 5.3NVD modified 2026-10-19 17:16

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 1