CVE-2025-5802
Medium
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.
SeverityMedium
CVSS5.3
Exploit probability—
ProductWSO2 API Manager
PublishedSep 15, 2026
First seenSep 15, 2026
Weakness typeCWE-203CWE-203
How to fix
Update
- WSO2 WSO2 API Manager3.1.0.354, 3.2.0.458, 3.2.0.478, 3.2.1.96, 4.0.0.379, 4.1.0.262, 4.2.0.200, 4.3.0.112, 4.4.0.72, 4.5.0.55, 4.6.0.17 or later
- WSO2 WSO2 API Control Plane4.5.0.56, 4.6.0.18 or later
- WSO2 WSO2 Universal Gateway4.5.0.55, 4.6.0.17 or later
- WSO2 WSO2 Traffic Manager4.5.0.54, 4.6.0.17 or later
- WSO2 WSO2 Identity Server5.10.0.383, 5.11.0.430, 6.0.0.257, 6.1.0.234, 6.1.0.257, 7.0.0.133, 7.1.0.41, 7.2.0.3 or later
- WSO2 WSO2 Identity Server as Key Manager5.10.0.374 or later
- WSO2 WSO2 Open Banking AM2.0.0.403 or later
- WSO2 WSO2 Open Banking IAM2.0.0.423 or later
- WSO2 WSO2 Carbon Identity Management Endpoint Util5.17.5.332, 5.18.187.330, 5.23.8.213, 5.25.92.167, 7.0.78.162 or later
- WSO2 WSO2 Carbon Identity Application Authentication Framework5.17.5.332, 5.18.187.330 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| WSO2 WSO2 API Manager | 3.1.0 ≤ v < 3.1.0.354, 3.2.0 ≤ v < 3.2.0.458, 3.2.0 ≤ v < 3.2.0.478, 3.2.1 ≤ v < 3.2.1.96, 4.0.0 ≤ v < 4.0.0.379, 4.1.0 ≤ v < 4.1.0.262, 4.2.0 ≤ v < 4.2.0.200, 4.3.0 ≤ v < 4.3.0.112, 4.4.0 ≤ v < 4.4.0.72, 4.5.0 ≤ v < 4.5.0.55, 4.6.0 ≤ v < 4.6.0.17 | 3.1.0.354, 3.2.0.458, 3.2.0.478, 3.2.1.96, 4.0.0.379, 4.1.0.262, 4.2.0.200, 4.3.0.112, 4.4.0.72, 4.5.0.55, 4.6.0.17 |
| WSO2 WSO2 API Control Plane | 4.5.0 ≤ v < 4.5.0.56, 4.6.0 ≤ v < 4.6.0.18 | 4.5.0.56, 4.6.0.18 |
| WSO2 WSO2 Universal Gateway | 4.5.0 ≤ v < 4.5.0.55, 4.6.0 ≤ v < 4.6.0.17 | 4.5.0.55, 4.6.0.17 |
| WSO2 WSO2 Traffic Manager | 4.5.0 ≤ v < 4.5.0.54, 4.6.0 ≤ v < 4.6.0.17 | 4.5.0.54, 4.6.0.17 |
| WSO2 WSO2 Identity Server | 5.10.0 ≤ v < 5.10.0.383, 5.11.0 ≤ v < 5.11.0.430, 6.0.0 ≤ v < 6.0.0.257, 6.1.0 ≤ v < 6.1.0.234, 6.1.0 ≤ v < 6.1.0.257, 7.0.0 ≤ v < 7.0.0.133, 7.1.0 ≤ v < 7.1.0.41, 7.2.0 ≤ v < 7.2.0.3 | 5.10.0.383, 5.11.0.430, 6.0.0.257, 6.1.0.234, 6.1.0.257, 7.0.0.133, 7.1.0.41, 7.2.0.3 |
| WSO2 WSO2 Identity Server as Key Manager | 5.10.0 ≤ v < 5.10.0.374 | 5.10.0.374 |
| WSO2 WSO2 Open Banking AM | 2.0.0 ≤ v < 2.0.0.403 | 2.0.0.403 |
| WSO2 WSO2 Open Banking IAM | 2.0.0 ≤ v < 2.0.0.423 | 2.0.0.423 |
| WSO2 WSO2 Carbon Identity Management Endpoint Util | 5.17.5 ≤ v < 5.17.5.332, 5.18.187 ≤ v < 5.18.187.330, 5.23.8 ≤ v < 5.23.8.213, 5.25.92 ≤ v < 5.25.92.167, 7.0.78 ≤ v < 7.0.78.162 | 5.17.5.332, 5.18.187.330, 5.23.8.213, 5.25.92.167, 7.0.78.162 |
| WSO2 WSO2 Carbon Identity Application Authentication Framework | 5.17.5 ≤ v < 5.17.5.332, 5.18.187 ≤ v < 5.18.187.330 | 5.17.5.332, 5.18.187.330 |
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