Information Disclosure via Multi-Tenant Authentication Flows in WSO2 Identity Server Allows Cross-Tenant PII Exposure

published 2026-08-06 3 mo ago modified 2026-09-29 41 d ago also EUVD-2025-210630

cvss: 4.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 28%
public exploits: 0; none known

The system accepts authentication requests without sufficient validation to enforce tenant isolation when using Email OTP, SMS OTP, or Magic Link as first-factor authenticators. This failure to adequately separate user data between tenants can lead to the exposure of personally identifiable information.

Successful exploitation allows an attacker to disclose personally identifiable information of users in different tenants, resulting in privacy violations and potential regulatory non-compliance. This may include unauthorized access to user details such as mobile numbers.

Patch / fix

fixed in 5

WSO2 WSO2 Identity Server 7.0.0.134, 7.1.0.42
WSO2 WSO2 Carbon Identity Application Authentication Framework 7.0.78.162, 7.8.23.66, 7.8.550
WSO2 WSO2 Carbon MagicLink Authenticator Module 1.1.22.6, 1.1.31.3, 1.1.45
WSO2 WSO2 Carbon Abstract OTP Authenticator 1.0.5.4, 1.0.10.1, 1.0.24
WSO2 Email OTP Authenticator 1.0.30.4, 1.0.51

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 3 mo ago (2026-08-06)

Exploit prediction

0.35% chance of exploitation in the next 30 days, higher than 28% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	4.3	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Affected products

WSO2 WSO2 Identity Server
WSO2 WSO2 Carbon Identity Application Authentication Framework
WSO2 WSO2 Carbon MagicLink Authenticator Module
WSO2 WSO2 Carbon Abstract OTP Authenticator
WSO2 Email OTP Authenticator

Classification

Weakness

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
CWE-20 Improper Input Validation

References

security.docs.wso2.com /en/latest/security-announcements/security-advisories/2026/WSO2-2025-4731/
vendor-advisory

Sources

CVE List CVE-2025-13909
NVD CVE-2025-13909

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary