Apache Shiro session fixation (1.0-2.1.0, 3.0.0-alpha-1)
CVE-2026-43827 Published on May 25, 2026
Apache Shiro: Session fixation: new session is not created after login by default
Default configurations of Apache Shiro have a session fixation vulnerability.
This issue affects Apache Shiro from 1.0 to 2.1.0, and 3.0.0-alpha-1.
Users are recommended to upgrade to version 2.1.1, or 3.0.0-alpha-2 or later, which fixes the issue.
In the affected versions, when a session already exists, it is not invalidated upon successful login, nor is a new session being generated with a new ID.
Weakness Type
Session Fixation
Authenticating a user, or otherwise establishing a new user session, without invalidating any existing session identifier gives an attacker the opportunity to steal authenticated sessions.
Products Associated with CVE-2026-43827
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Affected Versions
Apache Software Foundation Apache Shiro:- Version 1.0, <= 2.1.0 is affected.
- Version 3.0.0-alpha-0, <= 3.0.0-alpha-1 is affected.