CVE-2026-43827: Apache Shiro

Medium severity, CVSS 6.5. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Apache Shiro: before 2.1.1 (fixed in 2.1.1); version 3.0.0 only

Published 2026-05-25. Last modified 2026-07-24.