CVE-2026-43827
Medium
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.
SeverityMedium
CVSS6.5
Exploit probability—
Product
Apache Shiro
PublishedMay 25, 2026
First seenMay 25, 2026
Weakness typeCWE-384CWE-384
How to fix
Update
- apache shiro2.1.1 or later
- org.apache.shiro:shiro-core2.2.0, 3.0.0-alpha-2 or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| apache shiro | v < 2.1.1, 3.0.0 | 2.1.1 |
| org.apache.shiro:shiro-coreMaven | 1.0.0-incubating ≤ v < 2.2.0, 3.0.0-alpha-1 ≤ v < 3.0.0-alpha-2 | 2.2.0, 3.0.0-alpha-2 |
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