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Username Enumeration via SMS OTP Flow in WSO2 Identity Server Allows User Account Discovery

Published Sep 15, 2026

Description

The SMS OTP flow fails to adequately handle error messages, allowing an attacker to infer the existence of registered user accounts based on the responses received during the OTP initiation process.

This weakness can be exploited by an attacker to discover valid usernames within the system. The impact is amplified for accounts that have not configured a mobile number, as the enumeration is specifically tied to this condition. The discovery of these usernames can facilitate subsequent brute force attacks, social engineering attempts, and information leakage, potentially leading to reputational damage, loss of customer trust, and regulatory non-compliance.

Affected products

Remediation

Vendor solution

Follow the instructions given on https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2025-4353/#solution

Weaknesses (1)

References (1)

Change history (0)

No recorded changes yet.

Sources
CVE.org / MITRE
Status PUBLISHED
Assigner WSO2
Published Sep 15, 2026
Updated Sep 15, 2026
Reserved Nov 14, 2025
CISA Vulnrichment
Updated Sep 15, 2026
NVD
Status Deferred
Modified Sep 18, 2026
Red Hat
Severity n/a
Public date n/a