PT-2026-43118 · Apache · Apache Shiro

Rasmus Moorats · Published 2026-05-25 · Updated 2026-05-25 · CVE-2026-43827

Mitre

CVSS v4.0

5.9

Medium

Base vector

AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N/AU:Y/R:U/RE:L/U:Amber

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.

Fix

Session Fixation

Weakness Enumeration

CWE-384

Related Identifiers

CVE-2026-43827

Affected Products

Apache Shiro

References · 3

• https://shiro.apache.org/security-reports.html#cve_2026_43827 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-43827 · Security Note
• http://openwall.com/lists/oss-security/2026/05/25/6 · Note