CVE-2026-43827

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

CVSS 5.9 MEDIUMEPSS 0.4%CWE-384

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 5.9EPSS 0.4%KEV nãoPoC —Nuclei —Metasploit —Patch referenciado

Lifecycle

25 May 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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: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

Affected products

Apache Software Foundation · Apache Shiro

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References

https://shiro.apache.org/security-reports.html#cve_2026_43827 http://www.openwall.com/lists/oss-security/2026/05/25/6