CVE-2026-43827

MEDIUM

Apache Shiro: Session fixation: new session is not created after login by default

Title source: cna

Description

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 (2)

Core 2

Core References

Vendor Advisory vendor-advisory

https://shiro.apache.org/security-reports.html#cve_2026_43827

Mailing List

http://www.openwall.com/lists/oss-security/2026/05/25/6

Scores

CVSS v3 6.5

EPSS 0.0041

EPSS Percentile 32.6%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-384

Status published

Products (4)

apache/shiro 3.0.0 alpha1

apache/shiro < 2.1.1

Apache Software Foundation/Apache Shiro 1.0 - 2.1.0

Apache Software Foundation/Apache Shiro 3.0.0-alpha-0 - 3.0.0-alpha-1

Published May 25, 2026

Tracked Since May 26, 2026