WebSEAL is IBM’s policy-enforcement gateway for protected web resources. It sits in front of applications and acts as a control point for authentication, authorization, session management, and request routing. In practice, it behaves like a reverse proxy that decides whether a user or service is allowed to reach a backend resource.
WebSEAL matters because a weakness in this layer can affect many dependent applications at once. If it is misconfigured or vulnerable, attackers may try to bypass access controls, steal or reuse sessions, or abuse trust relationships between the gateway and back-end services. Defenders use WebSEAL to centralize policy enforcement, reduce direct exposure of applications, and apply consistent login and access rules. When patching or hardening identity infrastructure, administrators should treat WebSEAL as a high-priority component because it often sits on the path that defines who can get in and what they can access.