CVE-2026-43827: Apache Shiro has a session fixation vulnerability

May 26, 2026 (updated June 30, 2026)

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.

References

github.com/advisories/GHSA-fcvm-3cpj-f9qx
nvd.nist.gov/vuln/detail/CVE-2026-43827
shiro.apache.org/security-reports.html

Code Behaviors & Features

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