CVE-2026-43827
Apache Shiro has a session fixation vulnerability
6.5
MEDIUM
CVSS 3.1
EPSS 0.41%
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.
How to fix CVE-2026-43827
To remediate CVE-2026-43827, upgrade the affected package to a fixed version below.
- —no fix listed
- —upgrade to 2.2.0 or later
Is CVE-2026-43827 being exploited?
Low — EPSS is 0.4%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0
- >= 1.0.0-incubating, < 2.2.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | 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/RE:L/U:Amber |
| osv | CVSS 3.1 | MEDIUM6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N |