CVE-2025-13736 json
Username Enumeration via Login Interface in Multiple WSO2 Products Allows User Account Discovery
published 2026-08-06 3 mo ago modified 2026-09-29 41 d ago also EUVD-2025-210626
- cvss
- 3.7
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 19%
- public exploits
- 0
- none known
Summary
When Multi-Attribute Login is enabled, the login interface fails to consistently mask the existence of user accounts. For valid users, the server resolves and displays their canonical username, while for non-existent users, it echoes the original input. This occurs regardless of the validate_username configuration.
The discovery of valid usernames can increase the risk of brute force attacks, social engineering attacks, and targeted information leakage. Attackers can leverage this information to craft more effective phishing campaigns or social engineering tactics to compromise user accounts or extract sensitive data.
Patch / fix
- WSO2 WSO2 Identity Server as Key Manager 5.10.0.371
- WSO2 WSO2 Identity Server 5.10.0.380, 5.11.0.427, 6.0.0.254, 6.1.0.255, 7.0.0.132, 7.1.0.40, 7.2.0.2
- WSO2 WSO2 Open Banking AM 2.0.0.400
- WSO2 WSO2 API Manager 3.1.0.351, 3.2.0.455, 4.0.0.375
- WSO2 WSO2 Open Banking IAM 2.0.0.420
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 3 mo ago
Exploit prediction
0.27% chance of exploitation in the next 30 days, higher than 19% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 3.7 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N |
Affected products
- WSO2 WSO2 Identity Server as Key Manager
- WSO2 WSO2 Identity Server
- WSO2 WSO2 Open Banking AM
- WSO2 WSO2 API Manager
- WSO2 WSO2 Open Banking IAM
Classification
- Weakness
-
- CWE-203 Observable Discrepancy
References
Sources
- CVE List CVE-2025-13736
- NVD CVE-2025-13736
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.