Vulnerability · Published Sep 15, 2026 · Assigned by WSO2
CVE-2025-5802Username Enumeration via Self Registration Flow in Multiple WSO2 Products Allows User Account Discovery
Medium 5.3
In plain English
A medium-severity security flaw in WSO2 API Control Plane from WSO2. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| WSO2 | WSO2 API Manager | 3.1.0 – before 3.1.0.3543.2.0 – before 3.2.0.4583.2.0 – before 3.2.0.4783.2.1 – before 3.2.1.964.0.0 – before 4.0.0.3794.1.0 – before 4.1.0.2624.2.0 – before 4.2.0.200 |
| WSO2 | WSO2 API Control Plane | 4.5.0 – before 4.5.0.564.6.0 – before 4.6.0.18 |
| WSO2 | WSO2 Universal Gateway | 4.5.0 – before 4.5.0.554.6.0 – before 4.6.0.17 |
| WSO2 | WSO2 Traffic Manager | 4.5.0 – before 4.5.0.544.6.0 – before 4.6.0.17 |
| WSO2 | WSO2 Identity Server | 5.10.0 – before 5.10.0.3835.11.0 – before 5.11.0.4306.0.0 – before 6.0.0.2576.1.0 – before 6.1.0.2346.1.0 – before 6.1.0.2577.0.0 – before 7.0.0.1337.1.0 – before 7.1.0.41 |
| WSO2 | WSO2 Identity Server as Key Manager | 5.10.0 – before 5.10.0.374 |
| WSO2 | WSO2 Open Banking AM | 2.0.0 – before 2.0.0.403 |
| WSO2 | WSO2 Open Banking IAM | 2.0.0 – before 2.0.0.423 |
| WSO2 | WSO2 Carbon Identity Management Endpoint Util | 5.17.5 – before 5.17.5.3325.18.187 – before 5.18.187.3305.23.8 – before 5.23.8.2135.25.92 – before 5.25.92.1677.0.78 – before 7.0.78.162 |
| WSO2 | WSO2 Carbon Identity Application Authentication Framework | 5.17.5 – before 5.17.5.3325.18.187 – before 5.18.187.330 |
Weakness: CWE-203 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N