Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Apache | Shiro | < 2.1.1 |
Related Weaknesses (CWE)
References
- https://shiro.apache.org/security-reports.html#cve_2026_43827Vendor Advisory
- http://www.openwall.com/lists/oss-security/2026/05/25/6Mailing ListThird Party Advisory
FAQ
What is CVE-2026-43827?
CVE-2026-43827 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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,...
How severe is CVE-2026-43827?
CVE-2026-43827 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-43827?
Check the references section above for vendor advisories and patch information. Affected products include: Apache Shiro.