CVE-2026-43827
Published:May 25, 2026
Updated:June 11, 2026
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.
Affected Packages
https://github.com/apache/shiro.git (GITHUB):
Affected version(s) >=shiro-root-2.0.0 <shiro-root-2.2.0Fix Suggestion:
Update to version shiro-root-2.2.0org.apache.shiro:shiro-core (JAVA):
Affected version(s) >=2.0.0 <2.2.0Fix Suggestion:
Update to version 2.2.0org.apache.shiro:shiro-web (JAVA):
Affected version(s) >=2.0.0 <2.2.0Fix Suggestion:
Update to version 2.2.0org.apache.shiro:shiro-core (JAVA):
Affected version(s) =3.0.0-alpha-1 <3.0.0-alpha-2Fix Suggestion:
Update to version 3.0.0-alpha-2org.apache.shiro:shiro-web (JAVA):
Affected version(s) =3.0.0-alpha-1 <3.0.0-alpha-2Fix Suggestion:
Update to version 3.0.0-alpha-2Related Resources (2)
Do you need more information?
Contact UsCVSS v4
Base Score:
5.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
ACTIVE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
LOW
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.4
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Session Fixation
EPSS
Base Score:
0.07