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Fencer Vulns
medium 5.3

CVE-2025-5802 json

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

published 2026-09-15 54 d ago modified 2026-09-18 51 d ago also EUVD-2025-210910

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 26%
public exploits
0
none known

Summary

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.

Patch / fix

  • WSO2 WSO2 API Manager 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 4.5.0.56, 4.6.0.18
  • WSO2 WSO2 Universal Gateway 4.5.0.55, 4.6.0.17
  • WSO2 WSO2 Traffic Manager 4.5.0.54, 4.6.0.17
  • WSO2 WSO2 Identity Server 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 5.10.0.374
  • WSO2 WSO2 Open Banking AM 2.0.0.403
  • WSO2 WSO2 Open Banking IAM 2.0.0.423
  • WSO2 WSO2 Carbon Identity Management Endpoint Util 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 5.17.5.332, 5.18.187.330

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
54 d ago

Exploit prediction

0.33% chance of exploitation in the next 30 days, higher than 26% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected products

  • WSO2 WSO2 API Manager
  • WSO2 WSO2 API Control Plane
  • WSO2 WSO2 Universal Gateway
  • WSO2 WSO2 Traffic Manager
  • WSO2 WSO2 Identity Server
  • WSO2 WSO2 Identity Server as Key Manager
  • WSO2 WSO2 Open Banking AM
  • WSO2 WSO2 Open Banking IAM
  • WSO2 WSO2 Carbon Identity Management Endpoint Util
  • WSO2 WSO2 Carbon Identity Application Authentication Framework

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.