CVE-2026-43827: Shiro core Apache Shiro Has A Session Vulnerability

MODERATE
Advisory Identifier: GHSA-fcvm-3cpj-f9qx
Share
CWE-384
Published
Advisory Summary

CVE-2026-43827 is a MODERATE apache shiro has a session vulnerability (CWE-384: Session Fixation) affecting Shiro core libraries in the Maven ecosystem. The issue involves apache shiro has a session fixation vulnerability. Remediation is available by upgrading affected packages to version 2.2.0, 3.0.0-alpha-2.

CVE-2026-43827 at a Glance

CVE Identifier CVE-2026-43827
GHSA Identifier GHSA-fcvm-3cpj-f9qx
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-384: Session Fixation
Affected Product Shiro core
Package Ecosystem Maven
Published Date
Last Updated

How to Fix CVE-2026-43827

To remediate this vulnerability, upgrade all affected Shiro core dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

org.apache.shiro:shiro-core fixed: 2.2.0 
<dependency>
    <groupId>org.apache.shiro</groupId>
    <artifactId>shiro-core</artifactId>
    <version>2.2.0</version>
</dependency>
org.apache.shiro:shiro-core fixed: 3.0.0-alpha-2 
<dependency>
    <groupId>org.apache.shiro</groupId>
    <artifactId>shiro-core</artifactId>
    <version>3.0.0-alpha-2</version>
</dependency>
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree -Dincludes=org.apache.shiro

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-43827, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.apache.shiro

Analyze the terminal output to locate any version of Shiro core in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.2.0), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.apache.shiro command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-384: Session Fixation, where authenticating a user, or otherwise establishing a new user session, without invalidating any existing session identifier gives an attacker the opportunity to steal authenticated sessions. In Shiro core, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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.

CVE-2026-43827 Affected Shiro core Versions

2 component(s)
Fixed Versions:
2.2.03.0.0-alpha-2
Product / Package Ecosystem Affected Versions Fixed Version
org.apache.shiro:shiro-core
maven/org.apache.shiro/shiro-core
Maven
≥ 1.0.0-incubating
< 2.2.0
2.2.0
org.apache.shiro:shiro-core
maven/org.apache.shiro/shiro-core
Maven
≥ 3.0.0-alpha-1
< 3.0.0-alpha-2
All 1 versions
3.0.0-alpha-1
3.0.0-alpha-2

References

NVD — CVE-2026-43827 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-43827
Shiro core Source Repository REPOSITORY
https://github.com/apache/shiro
Shiro core Security Information SECURITY
https://shiro.apache.org/security-reports.html#cve_2026_43827
Shiro core Security Information SECURITY
http://www.openwall.com/lists/oss-security/2026/05/25/6

Frequently Asked Questions

What is CVE-2026-43827?
CVE-2026-43827 is a security vulnerability in Shiro core involving Apache Shiro has a session fixation vulnerability under CWE-384: Session Fixation.
Which Shiro core versions are affected?
Affected versions include releases prior to 2.2.0, 3.0.0-alpha-2 across affected packages: org.apache.shiro:shiro-core.
What version fixes CVE-2026-43827?
Upgrading to 2.2.0, 3.0.0-alpha-2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is shiro-core affected?
Yes, org.apache.shiro:shiro-core is affected in releases prior to 2.2.0, 3.0.0-alpha-2. Upgrade your dependency to 2.2.0, 3.0.0-alpha-2 or later.
What CWE is associated with CVE-2026-43827?
CVE-2026-43827 is classified under CWE-384: Session Fixation (Authenticating a user, or otherwise establishing a new user session, without invalidating any existing session identifier gives an attacker the opportunity to steal authenticated sessions.).
How can I check Maven dependencies for CVE-2026-43827?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.apache.shiro'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-fcvm-3cpj-f9qx",
  "modified" : "2026-06-30T17:26:23Z",
  "published" : "2026-05-26T13:30:50Z",
  "aliases" : [ "CVE-2026-43827" ],
  "summary" : "Apache Shiro has a session fixation vulnerability",
  "details" : "Default configurations of Apache Shiro have a session fixation vulnerability.\n\nThis issue affects Apache Shiro from 1.0 to 2.1.0, and 3.0.0-alpha-1.\n\nUsers are recommended to upgrade to version 2.1.1, or 3.0.0-alpha-2 or later, which fixes the issue.\n\nIn 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.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "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"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.apache.shiro:shiro-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.0.0-incubating"
      }, {
        "fixed" : "2.2.0"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.apache.shiro:shiro-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.0.0-alpha-1"
      }, {
        "fixed" : "3.0.0-alpha-2"
      } ]
    } ],
    "versions" : [ "3.0.0-alpha-1" ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-43827"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/apache/shiro"
  }, {
    "type" : "WEB",
    "url" : "https://shiro.apache.org/security-reports.html#cve_2026_43827"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2026/05/25/6"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-384" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-06-30T17:26:23Z",
    "nvd_published_at" : "2026-05-25T21:16:34Z"
  }
}