CVE-2025-13166Username Enumeration via SMS OTP Flow in WSO2 Identity Server Allows User Account Discovery
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It affects WSO2 Identity Server. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 3.7 LOW (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
- Weakness (CWE)
- CWE-203
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- WSO2
- NVD analysis
- Deferred
- Record last updated
- Sep 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
WSO2 WSO2 Identity Server wso2:identity_server (from the name) | from 7.1.0 before 7.1.0.40; from 7.2.0 before 7.2.0.2 | CNA record |
References
- https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2025-4353/vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.