CVE-2025-5802 PUBLISHED

Username Enumeration via Self Registration Flow in Multiple WSO2 Products Allows User Account Discovery

Assigner: WSO2
Reserved: 06.06.2025 Published: 15.09.2026 Updated: 15.09.2026

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.

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CVSS Score: 5.3

Product Status

Vendor WSO2
Product WSO2 API Manager
Versions Default: unaffected
  • unknown from 0 to 3.1.0 (excl.)
  • affected from 3.1.0 to 3.1.0.354 (excl.)
  • affected from 3.2.0 to 3.2.0.458 (excl.)
  • affected from 3.2.0 to 3.2.0.478 (excl.)
  • affected from 3.2.1 to 3.2.1.96 (excl.)
  • affected from 4.0.0 to 4.0.0.379 (excl.)
  • affected from 4.1.0 to 4.1.0.262 (excl.)
  • affected from 4.2.0 to 4.2.0.200 (excl.)
  • affected from 4.3.0 to 4.3.0.112 (excl.)
  • affected from 4.4.0 to 4.4.0.72 (excl.)
  • affected from 4.5.0 to 4.5.0.55 (excl.)
  • affected from 4.6.0 to 4.6.0.17 (excl.)
Vendor WSO2
Product WSO2 API Control Plane
Versions Default: unaffected
  • unknown from 0 to 4.5.0 (excl.)
  • affected from 4.5.0 to 4.5.0.56 (excl.)
  • affected from 4.6.0 to 4.6.0.18 (excl.)
Vendor WSO2
Product WSO2 Universal Gateway
Versions Default: unaffected
  • unknown from 0 to 4.5.0 (excl.)
  • affected from 4.5.0 to 4.5.0.55 (excl.)
  • affected from 4.6.0 to 4.6.0.17 (excl.)
Vendor WSO2
Product WSO2 Traffic Manager
Versions Default: unaffected
  • unknown from 0 to 4.5.0 (excl.)
  • affected from 4.5.0 to 4.5.0.54 (excl.)
  • affected from 4.6.0 to 4.6.0.17 (excl.)
Vendor WSO2
Product WSO2 Identity Server
Versions Default: unaffected
  • unknown from 0 to 5.10.0 (excl.)
  • affected from 5.10.0 to 5.10.0.383 (excl.)
  • affected from 5.11.0 to 5.11.0.430 (excl.)
  • affected from 6.0.0 to 6.0.0.257 (excl.)
  • affected from 6.1.0 to 6.1.0.234 (excl.)
  • affected from 6.1.0 to 6.1.0.257 (excl.)
  • affected from 7.0.0 to 7.0.0.133 (excl.)
  • affected from 7.1.0 to 7.1.0.41 (excl.)
  • affected from 7.2.0 to 7.2.0.3 (excl.)
Vendor WSO2
Product WSO2 Identity Server as Key Manager
Versions Default: unaffected
  • unknown from 0 to 5.10.0 (excl.)
  • affected from 5.10.0 to 5.10.0.374 (excl.)
Vendor WSO2
Product WSO2 Open Banking AM
Versions Default: unaffected
  • unknown from 0 to 2.0.0 (excl.)
  • affected from 2.0.0 to 2.0.0.403 (excl.)
Vendor WSO2
Product WSO2 Open Banking IAM
Versions Default: unaffected
  • unknown from 0 to 2.0.0 (excl.)
  • affected from 2.0.0 to 2.0.0.423 (excl.)
Vendor WSO2
Product WSO2 Carbon Identity Management Endpoint Util
Versions Default: unknown
  • affected from 5.17.5 to 5.17.5.332 (excl.)
  • affected from 5.18.187 to 5.18.187.330 (excl.)
  • affected from 5.23.8 to 5.23.8.213 (excl.)
  • affected from 5.25.92 to 5.25.92.167 (excl.)
  • affected from 7.0.78 to 7.0.78.162 (excl.)
  • unaffected from x to * (incl.)
Vendor WSO2
Product WSO2 Carbon Identity Application Authentication Framework
Versions Default: unknown
  • affected from 5.17.5 to 5.17.5.332 (excl.)
  • affected from 5.18.187 to 5.18.187.330 (excl.)
  • unaffected from x to * (incl.)

Solutions

Follow the instructions given on https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2025-4227/#solution

References

Problem Types

  • CWE-203: Information Disclosure Through Error Messages CWE

Impacts

  • CAPEC-101 CAPEC-101: User Enumeration