CVE-2025-5802: WSO2 API Control Plane

Medium severity, CVSS 5.3. EPSS: 0.3% chance of exploitation in the next 30 days.

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

WSO2 WSO2 API Control Plane: from 4.5.0, before 4.5.0.56 (fixed in 4.5.0.56); from 4.6.0, before 4.6.0.18 (fixed in 4.6.0.18)
WSO2 WSO2 API Manager: from 3.1.0, before 3.1.0.354 (fixed in 3.1.0.354); from 3.2.0, before 3.2.0.458 (fixed in 3.2.0.458); from 3.2.0, before 3.2.0.478 (fixed in 3.2.0.478); from 3.2.1, before 3.2.1.96 (fixed in 3.2.1.96); from 4.0.0, before 4.0.0.379 (fixed in 4.0.0.379); from 4.1.0, before 4.1.0.262 (fixed in 4.1.0.262); …
WSO2 WSO2 Carbon Identity Application Authentication Framework: from 5.17.5, before 5.17.5.332 (fixed in 5.17.5.332); from 5.18.187, before 5.18.187.330 (fixed in 5.18.187.330)
WSO2 WSO2 Carbon Identity Management Endpoint Util: from 5.17.5, before 5.17.5.332 (fixed in 5.17.5.332); from 5.18.187, before 5.18.187.330 (fixed in 5.18.187.330); from 5.23.8, before 5.23.8.213 (fixed in 5.23.8.213); from 5.25.92, before 5.25.92.167 (fixed in 5.25.92.167); from 7.0.78, before 7.0.78.162 (fixed in 7.0.78.162)
WSO2 WSO2 Identity Server: from 5.10.0, before 5.10.0.383 (fixed in 5.10.0.383); from 5.11.0, before 5.11.0.430 (fixed in 5.11.0.430); from 6.0.0, before 6.0.0.257 (fixed in 6.0.0.257); from 6.1.0, before 6.1.0.234 (fixed in 6.1.0.234); from 6.1.0, before 6.1.0.257 (fixed in 6.1.0.257); from 7.0.0, before 7.0.0.133 (fixed in 7.0.0.133); …
WSO2 WSO2 Identity Server As Key Manager: from 5.10.0, before 5.10.0.374 (fixed in 5.10.0.374)
WSO2 WSO2 Open Banking AM: from 2.0.0, before 2.0.0.403 (fixed in 2.0.0.403)
WSO2 WSO2 Open Banking Iam: from 2.0.0, before 2.0.0.423 (fixed in 2.0.0.423)
WSO2 WSO2 Traffic Manager: from 4.5.0, before 4.5.0.54 (fixed in 4.5.0.54); from 4.6.0, before 4.6.0.17 (fixed in 4.6.0.17)
WSO2 WSO2 Universal Gateway: from 4.5.0, before 4.5.0.55 (fixed in 4.5.0.55); from 4.6.0, before 4.6.0.17 (fixed in 4.6.0.17)

Published 2026-09-15. Last modified 2026-09-18.