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.
Metrics
Affected Vendors & Products
References
History
Tue, 15 Sep 2026 22:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| CPEs | cpe:2.3:a:wso2:wso2_identity_server:*:*:*:*:*:*:*:* |
Tue, 15 Sep 2026 13:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
Tue, 15 Sep 2026 12:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Wso2
Wso2 wso2 Identity Server |
|
| Vendors & Products |
Wso2
Wso2 wso2 Identity Server |
Tue, 15 Sep 2026 10:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | Username Enumeration via SMS OTP Flow in WSO2 Identity Server Allows User Account Discovery | |
| Weaknesses | CWE-203 | |
| References |
| |
| Metrics |
cvssV3_1
|
Status: PUBLISHED
Assigner: WSO2
Published: 2026-09-15T09:53:54.532Z
Updated: 2026-09-15T22:15:37.413Z
Reserved: 2025-11-14T06:00:52.219Z
Link: CVE-2025-13166
Updated: 2026-09-15T12:43:39.447Z
Status : Deferred
Published: 2026-09-15T10:17:00.877
Modified: 2026-10-14T19:10:00.297
Link: CVE-2025-13166
No data.