Bug 2481287 (CVE-2026-43827)

Summary:	CVE-2026-43827 apache-shiro: Apache Shiro: Session fixation vulnerability due to improper session invalidation upon login
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	anujha, asoldano, bbaranow, bmaxwell, bstansbe, dlofthou, gmalinko, istudens, ivassile, iweiss, janstey, mosmerov, msvehla, nwallace, pdelbell, pesilva, pjindal, pmackay, rstancel, rstepani, thjenkin, vdosoudi
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
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Doc Text:	A flaw was found in Apache Shiro. This vulnerability, known as session fixation, allows an attacker to hijack a user's session. This occurs because the system fails to invalidate an existing session or generate a new session identifier after a user successfully logs in. Consequently, a remote attacker could exploit this to gain unauthorized access to a user's account and potentially sensitive information.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-05-25 21:01:13 UTC

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.