🛡️ CVE-2026-43827 — shiro

🟡 CVSS 6.5 — Medium ✅ No Known Exploit CWE-384 NVD
6.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Apache Shiro has a session fixation vulnerability 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 this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity none, availability none.

Weakness class

CVE-2026-43827 is classified as CWE-384: Session Fixation. A session identifier is not renewed at login, so an identifier planted beforehand becomes an authenticated session.

Affected software and timeline

Affected software: org.apache.shiro:shiro-core (from 3.0.0-alpha-1 up to 3.0.0-alpha-2), shiro and unknown. Published on 26 May 2026 and last revised on 30 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

nvd.nist.gov (Advisory)
github.com (Package)
shiro.apache.org (Web)
www.openwall.com (Web)

CVE-2026-43827 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Medium
CVSS Score 6.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
CWE CWE-384
Public Exploit ✅ No
Source NVD
Published 2026-05-26
Updated 2026-08-12
Modified 2026-06-30
Fix URL N/A

Affected Packages

Software From version Fixed in
org.apache.shiro:shiro-core 3.0.0-alpha-1 3.0.0-alpha-2
shiro — —
unknown — —

Similar Threats

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More CVE 2026 advisories

Part of CVE 2026 in the advisory index.