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CVE-2025-5802— Username Enumeration via Self Registration Flow in Multiple WSO2 Products Allows User Account Discovery

Quick assessment

Affected
WSO2 WSO2 API 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.

自注册流程在接收用户输入的用户名时，未能有效防止用户名的存在性泄露。当用户尝试使用已存在的用户名进行注册时，系统会返回一条明确提示该用户名已被占用的错误消息。 这种行为使得攻击者能够发现系统中有效的用户名。发现有效用户名有助于发起后续攻击，例如暴力破解、社会工程学攻击以及定向钓鱼攻击。

CVSS 5.3 · Medium

Possible ATT&CK Techniques 1 AI

T1079
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I. Basic Information for CVE-2025-5802

Vulnerability Information
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Vulnerability Title
Username Enumeration via Self Registration Flow in Multiple WSO2 Products Allows User Account Discovery
Source: CVE Program / CVE List V5
Vulnerability Description
The self-registration flow accepts user-supplied input for usernames without adequately preventing the disclosure of username existence. When a user attempts to register with an existing username, the system responds with an error message that explicitly indicates the username is already in use. This behavior allows an attacker to discover valid usernames within the system. The discovery of valid usernames can facilitate subsequent attacks such as brute force, social engineering, and targeted phishing campaigns.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/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

Affected Products

Vendor Product Affected Versions CPE Subscribe
WSO2 WSO2 API Manager 3.1.0 ~ 3.1.0.354 -
WSO2 WSO2 API Control Plane 4.5.0 ~ 4.5.0.56 -
WSO2 WSO2 Universal Gateway 4.5.0 ~ 4.5.0.55 -
WSO2 WSO2 Traffic Manager 4.5.0 ~ 4.5.0.54 -
WSO2 WSO2 Identity Server 5.10.0 ~ 5.10.0.383 -
WSO2 WSO2 Identity Server as Key Manager 5.10.0 ~ 5.10.0.374 -
WSO2 WSO2 Open Banking AM 2.0.0 ~ 2.0.0.403 -
WSO2 WSO2 Open Banking IAM 2.0.0 ~ 2.0.0.423 -
WSO2 WSO2 Carbon Identity Management Endpoint Util 5.17.5 ~ 5.17.5.332 -
WSO2 WSO2 Carbon Identity Application Authentication Framework 5.17.5 ~ 5.17.5.332 -

II. Public POCs for CVE-2025-5802

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III. Intelligence Information for CVE-2025-5802

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Vendor Advisories for CVE-2025-5802 (1)

Same Patch Batch · WSO2 · 2026-09-15 · 3 CVEs total

CVE-2026-19515 7.0 HIGH OS Command Injection via Unit Test Execution in WSO2 Integrator MI VS Code Extension Allow
CVE-2025-13166 3.7 LOW Username Enumeration via SMS OTP Flow in WSO2 Identity Server Allows User Account Discover

IV. Related Vulnerabilities

Same product: WSO2 API Manager
Same vendor: WSO2
Same weakness: CWE-203

V. Comments for CVE-2025-5802

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