CVE-2026-43827

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

State: Published
Severity: 5.9 Medium
Published: May 25, 2026
Updated: May 26, 2026
Reserved: May 2, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	5.9 Medium	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	apache

Weaknesses

CWE-384 Session Fixation

Affected Products

Product	Versions
Apache ShiroApache Software Foundation	1.0 through 2.1.0Affected 3.0.0-alpha-0 through 3.0.0-alpha-1Affected

References

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.