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Message-ID: <21af63d6-b04e-e474-e251-ef899b0843a3@apache.org>
Date: Mon, 25 May 2026 19:50:13 +0000
From: Lenny Primak <lprimak@...che.org>
To: oss-security@...ts.openwall.com
Subject: CVE-2026-43827: Apache Shiro: Session fixation: new session is not
created after login by default
Severity:
Affected versions:
- Apache Shiro (org.apache.shiro:shiro-core) 1.0 through 2.1.0
- Apache Shiro (org.apache.shiro:shiro-core) 3.0.0-alpha-0 through 3.0.0-alpha-1
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.
Credit:
Rasmus Moorats <xx@....ee> (finder)
Lenny Primak <lenny@...wlogix.com> (remediation developer)
References:
https://shiro.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-43827
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