CVE-2026-43827

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

Published May 25, 2026 CVSS 4.0 · 5.9 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-fcvm-3cpj-f9qx Apache Shiro has a session fixation vulnerability
History
Type Values Removed Values Added
CPEs cpe:2.3:a:apache:shiro:*:*:*:*:*:*:*:*
cpe:2.3:a:apache:shiro:3.0.0:alpha1:*:*:*:*:*:*
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N'}

Type Values Removed Values Added
First Time appeared Apache
Apache shiro
Vendors & Products Apache
Apache shiro
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Apache Shiro: Session fixation: new session is not created after login by default
Weaknesses CWE-384
References
Metrics cvssV4_0

{'score': 5.9, 'vector': 'CVSS:4.0/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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
apache
Published
Updated
May 26, 2026, 12:39 PM
Reserved
May 2, 2026, 10:26 PM
Status
Analyzed
Published
May 25, 2026, 9:16 PM
Modified
Jul 24, 2026, 10:10 AM