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CVE-2025-13736— Username Enumeration via Login Interface in Multiple WSO2 Products Allows User Account Discovery

Quick assessment

Affected
WSO2 WSO2 Identity Server as Key Manager
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WSO2 Identity Server是美国WSO2公司开源的一款身份认证服务器。 WSO2 Identity Server 5.10.0.371之前版本、WSO2 Identity Server 5.10.0.380之前版本、5.11.0.427之前版本、6.0.0.254之前版本、6.1.0.255之前版本、7.0.0.132之前版本、7.1.0.40之前版本和7.2.0.2之前版本、WSO2 Open Banking AM 2.0.0.400之前版本、WSO2 API Manager 3.1.0.

CVSS 3.7 · Low EPSS 0.27% · P17

Possible ATT&CK Techniques 1 AI

T1087 · Account Discovery

Affected Version Matrix 18

VendorProduct Version RangeStatus
WSO2 WSO2 API Manager < 3.1.0 unknown
3.1.0< 3.1.0.351 affected
3.2.0< 3.2.0.455 affected
4.0.0< 4.0.0.375 affected
WSO2 WSO2 Identity Server < 5.10.0 unknown
5.10.0< 5.10.0.380 affected
5.11.0< 5.11.0.427 affected
6.0.0< 6.0.0.254 affected
6.1.0< 6.1.0.255 affected
7.0.0< 7.0.0.132 affected
7.1.0< 7.1.0.40 affected
7.2.0< 7.2.0.2 affected
WSO2 WSO2 Identity Server as Key Manager < 5.10.0 unknown
5.10.0< 5.10.0.371 affected
WSO2 WSO2 Open Banking AM < 2.0.0 unknown
2.0.0< 2.0.0.400 affected
WSO2 WSO2 Open Banking IAM < 2.0.0 unknown
2.0.0< 2.0.0.420 affected
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I. Basic Information for CVE-2025-13736

Vulnerability Information
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Vulnerability Title
Username Enumeration via Login Interface in Multiple WSO2 Products Allows User Account Discovery
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过差异性导致的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
WSO2 Identity Server 侧信道信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WSO2 Identity Server是美国WSO2公司开源的一款身份认证服务器。 WSO2 Identity Server 5.10.0.371之前版本、WSO2 Identity Server 5.10.0.380之前版本、5.11.0.427之前版本、6.0.0.254之前版本、6.1.0.255之前版本、7.0.0.132之前版本、7.1.0.40之前版本和7.2.0.2之前版本、WSO2 Open Banking AM 2.0.0.400之前版本、WSO2 API Manager 3.1.0.
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
WSO2 WSO2 Identity Server as Key Manager 5.10.0 ~ 5.10.0.371 -
WSO2 WSO2 Identity Server 5.10.0 ~ 5.10.0.380 -
WSO2 WSO2 Open Banking AM 2.0.0 ~ 2.0.0.400 -
WSO2 WSO2 API Manager 3.1.0 ~ 3.1.0.351 -
WSO2 WSO2 Open Banking IAM 2.0.0 ~ 2.0.0.420 -

II. Public POCs for CVE-2025-13736

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III. Intelligence Information for CVE-2025-13736

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Vendor Advisories for CVE-2025-13736 (1)

Same Patch Batch · WSO2 · 2026-08-06 · 19 CVEs total

CVE-2026-5430 10.0 CRITICAL Authentication Bypass via JWT Algorithm Mismatch in Multiple WSO2 Products Allows Account
CVE-2026-1728 9.8 CRITICAL Privilege Escalation via System REST APIs in Multiple WSO2 Products Permits Admin Account
CVE-2025-15039 9.4 CRITICAL Account Takeover via Conditional Authentication Script Logic in Multiple WSO2 Products
CVE-2026-3418 9.1 CRITICAL Arbitrary File Upload via System REST API in Multiple WSO2 Products Allows Remote Code Exe
CVE-2025-14561 9.0 CRITICAL Access Control Bypass via Publisher REST APIs in Multiple WSO2 Products Allows Cross-Tenan
CVE-2026-3415 8.7 HIGH XML External Entity (XXE) Injection via Schema Validation in Multiple WSO2 Products Allows
CVE-2024-6541 6.8 MEDIUM Information Disclosure and Integrity Violation via Improper Message Context Handling in Mu
CVE-2024-6832 5.9 MEDIUM Account Lockout Failure via Secondary User Store Inaccessibility in Multiple WSO2 Products
CVE-2025-13394 5.4 MEDIUM Cross-Site Request Forgery via Ajax Processor Endpoints in Multiple WSO2 Products Enables
CVE-2025-12317 5.0 MEDIUM Improper Token Revocation via SOAP Services in Multiple WSO2 Products Allows Retained Acce
CVE-2024-8995 4.9 MEDIUM Authorization Code issued for Deleted User reuse in Multiple WSO2 Products Allows Unauthor
CVE-2026-0637 4.4 MEDIUM Sensitive Information Disclosure via Event Publisher Logging in Multiple WSO2 Products
CVE-2025-13909 4.3 MEDIUM Information Disclosure via Multi-Tenant Authentication Flows in WSO2 Identity Server Allow
CVE-2025-11850 4.3 MEDIUM Improper Implicit Association via User Store Initialization in WSO2 Identity Server [Ident
CVE-2025-6508 4.3 MEDIUM User Interface Misrepresentation via Swagger UI Try-out Console in WSO2 API Manager Allows
CVE-2024-10302 4.0 MEDIUM Improper Input Validation via Signup Process in Multiple WSO2 Products Enables Content Man
CVE-2025-14779 3.8 LOW Improper Access Control via Secret Type Management API in WSO2 Identity Server
CVE-2025-12627 2.4 LOW Improper Refresh Token Implementation via User Impersonation Flow in WSO2 Identity Server

IV. Related Vulnerabilities

Same product: WSO2 Identity Server as Key Manager
Same vendor: WSO2
Same weakness: CWE-203

V. Comments for CVE-2025-13736

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