CVE-2025-13166 — Username Enumeration via SMS OTP Flow in WSO2 Identity Server Allows User Account Discovery
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 OT…
Published: 2026-09-15 · CVSS: 3.7 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7