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Session Fixation CVE-2026-43827

| EUVDEUVD-2026-31736 MEDIUM
Session Fixation (CWE-384)
2026-05-25 apache GHSA-fcvm-3cpj-f9qx
Session Fixation Apache Information Disclosure
5.9
CVSS 4.0 · NVD
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Severity by source

NVD PRIMARY
5.9 MEDIUM
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:U/V:X/RE:L/U:Amber

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:U/V:X/RE:L/U:Amber
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
A
Scope
X

Lifecycle Timeline

1
CVE Published
May 25, 2026 - 20:19 nvd
UNKNOWN (no severity yet)

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 63 maven packages depend on org.apache.shiro:shiro-core (23 direct, 40 indirect)

Ecosystem-wide dependent count for version 1.0.0-incubating.

DescriptionCVE.org

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.

Analysis

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.

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Same weakness CWE-384 – Session Fixation

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CVE-2017-12965 CRITICAL POC
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CVE-2023-48929 CRITICAL POC
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CVE-2023-41012 CRITICAL POC
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Same technique Information Disclosure

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CVE-2013-2251 CRITICAL POC
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CVE-2017-0147 HIGH POC
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CVE-2014-6324 HIGH POC
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CVE-2026-43827 vulnerability details – vuln.today
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