Apache Shiro session fixation (1.0-2.1.0, 3.0.0-alpha-1)
CVE-2026-43827 Published on May 25, 2026

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

Vendor Advisory NVD

Vulnerability Analysis

CVE-2026-43827 can be exploited with network access. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity and availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
ACTIVE

Weakness Type

Session Fixation

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.


Products Associated with CVE-2026-43827

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Apache Shiro
 

Affected Versions

Apache Software Foundation Apache Shiro:

Exploit Probability

EPSS
0.41%
Percentile
33.80%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.