Executive brief
WSO2 Identity Server, a platform used for managing user identities and access, contains a flaw in its Magic Link login feature. An attacker can send a large volume of invalid login requests to exhaust the server's memory. This can crash the service, preventing legitimate users from logging into their accounts and disrupting business operations.
Technical details
A denial-of-service (DoS) vulnerability exists in the Magic Link authenticator of WSO2 Identity Server due to uncontrolled resource consumption (CWE-400). The authentication flow accepts multiple invalid requests without sufficient rate limiting or resource management, which leads to a steady increase in memory usage. An unauthenticated remote attacker can exploit this by repeatedly sending malformed or invalid authentication attempts, eventually exhausting available system memory and causing the service to become unavailable. The vulnerability is specific to deployments utilizing the Magic Link feature and has been addressed in WSO2 Identity Server 7.0.0 update level 121.
Affected products
- WSO2 Identity Server 7.0.0 before update 121
Timeline
- 2026-01-26: advisory: Initial advisory published by WSO2
- 2026-05-11: disclosed: CVE published to NVD