CVE-2026-43827

EUVD-2026-31736
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
6.5 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 33%
Affected Products (NVD)
VendorProductVersion
apacheshiro
𝑥
< 2.1.1
apacheshiro
3.0.0:alpha1
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
shiro
bookworm
no-dsa
bullseye
no-dsa
sid
vulnerable
trixie
no-dsa
Common Weakness Enumeration
References
https://shiro.apache.org/security-reports.html#cve_2026_43827
http://www.openwall.com/lists/oss-security/2026/05/25/6