What is CVE-2026-43827?

CVE-2026-43827 is a medium-severity vulnerability in Apache Shiro, classified under Session Fixation. CVSS score: 6.5/10. Published 2026-05-25.

How severe is CVE-2026-43827?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Apache Shiro

CVE-2026-43827

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…

EPSS: 0.001 (20.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.

Affected products

Apache Shiro — versions 3.0.0
Apache Software Foundation Shiro — versions 1.0, 3.0.0-alpha-0

Weakness classification (CWE)

CWE-384 — Session Fixation

References

security@apache.org (vendor-advisory, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-43827?: CVE-2026-43827 is a medium-severity vulnerability in Apache Shiro, classified under Session Fixation. CVSS score: 6.5/10. Published 2026-05-25.
How severe is CVE-2026-43827?: Medium severity. CVSS v3 base score is 6.5 out of 10.