CVE-2025-13166Network attack vector

Username enumeration via discrepant SMS OTP errors

Published Sep 15, 2026 · Updated Sep 15, 2026

Information disclosure in WSO2 Identity Server 7.1.0 and 7.2.0 allows remote attackers to enumerate usernames through SMS OTP requests. The SMS OTP flow returns distinguishable error responses when a registered account lacks a configured mobile number instead of presenting a uniform failure. No authentication is required, but the oracle is limited to accounts without mobile numbers and discloses account existence rather than credentials.

CVSS severity3.7
Low
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in WSO2 Identity Server 7.1.0 and 7.2.0 allows remote attackers to enumerate usernames through SMS OTP requests. The SMS OTP flow returns distinguishable error responses when a registered account lacks a configured mobile number instead of presenting a uniform failure. No authentication is required, but the oracle is limited to accounts without mobile numbers and discloses account existence rather than credentials.

The record

CVE
CVE-2025-13166
Published
Sep 15, 2026
Updated
Sep 15, 2026
Vendor
WSO2
Product
WSO2 Identity Server
Classifications
T1589
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=7.1.0 <7.1.0.40
  2. Affected versionversion=7.2.0 <7.2.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

WSO2 · WSO2 Identity Serverversion=7.1.0 <7.1.0.40; version=7.2.0 <7.2.0.2

Published CVSS scores

3.7WSO2CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1589Gather Victim Identity Information

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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