CVE WatchSep 15, 2026

CVE-2025-13166

The SMS OTP flow fails to adequately handle error messages, allowing an attacker to infer the existence of registered user accounts based on

CVSS

3.7

Low

EPSS

0.3%

p19

KEV

—

Exploit Today

0-100

Published: Sep 15, 2026 · Last modified: Sep 15, 2026 · CWE-203

EPSS · 30d

Not enough EPSS history yet.

Technical 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.

Official references

security.docs.wso2.comhttps://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2025-4353/

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