CVE-2026-43827
Analyzed Analyzed - Analysis Complete
Session Fixation in Apache Shiro

Publication date: 2026-05-25

Last updated on: 2026-05-28

Assigner: Apache Software Foundation

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.
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Meta Information
Published
2026-05-25
Last Modified
2026-05-28
Generated
2026-06-15
AI Q&A
2026-05-26
EPSS Evaluated
2026-06-14
NVD
CVE-2026-43827
EUVD
EUVD-2026-31736
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
apache shiro 3.0.0
apache shiro to 2.1.1 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-384 Authenticating a user, or otherwise establishing a new user session, without invalidating any existing session identifier gives an attacker the opportunity to steal authenticated sessions.
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Executive Summary

This vulnerability is a session fixation issue found in default configurations of Apache Shiro versions from 1.0 to 2.1.0 and 3.0.0-alpha-1.

In the affected versions, when a user logs in successfully, the existing session is not invalidated and no new session with a new ID is created.

This means an attacker could potentially fixate a session ID and hijack a user's session.

Mitigation Strategies

To mitigate the session fixation vulnerability in Apache Shiro, users are recommended to upgrade to version 2.1.1 or 3.0.0-alpha-2 or later, as these versions fix the issue.

The vulnerability arises because in affected versions (1.0 to 2.1.0 and 3.0.0-alpha-1), when a session already exists, it is not invalidated upon successful login, nor is a new session generated with a new ID.

Impact Analysis

The vulnerability can allow an attacker to hijack a user's session by exploiting the fact that the session ID does not change upon login.

This can lead to unauthorized access to user accounts and sensitive information.

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