CVE-2026-43827

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.

Score

CVSS 3.1 6.5 Medium

Status

Analyzed - security@apache.org

Published

2026-05-25

Last modified

2026-05-26

Weaknesses

CWE-384

Affected products

• Shiro (Apache)
• Apache Shiro (Apache Software Foundation)

References

• https://shiro.apache.org/security-reports.html#cve_2026_43827
• http://www.openwall.com/lists/oss-security/2026/05/25/6