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CVE-2026-23903— Apache Shiro: Auth bypass when accessing static files only on case-insensitive filesystems

Quick assessment

Affected
Apache Software Foundation Apache Shiro
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apache Shiro是美国阿帕奇（Apache）基金会的一套用于执行认证、授权、加密和会话管理的Java安全框架。 Apache Shiro 2.0.7之前版本存在安全漏洞，该漏洞源于备用名称身份验证绕过，可能导致在大小写不敏感的文件系统上绕过过滤器访问静态文件。

AI Predicted 5.3 Difficulty: Easy EPSS 0.36% · P27

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 1

VendorProduct Version RangeStatus
Apache Software Foundation Apache Shiro < 2.0.7 affected
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I. Basic Information for CVE-2026-23903

Vulnerability Information
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Vulnerability Title
Apache Shiro: Auth bypass when accessing static files only on case-insensitive filesystems
Source: CVE Program / CVE List V5
Vulnerability Description
Authentication Bypass by Alternate Name vulnerability in Apache Shiro. This issue affects Apache Shiro: before 2.0.7. Users are recommended to upgrade to version 2.0.7, which fixes the issue. The issue only effects static files. If static files are served from a case-insensitive filesystem, such as default macOS setup, static files may be accessed by varying the case of the filename in the request. If only lower-case (common default) filters are present in Shiro, they may be bypassed this way. Shiro 2.1.0 and later has a new parameters to remediate this issue shiro.ini: filterChainResolver.caseInsensitive = true application.properties: shiro.caseInsensitive=true Shiro 3.0.0 and later makes this the default in shiro.ini-based configurations. Shiro 3.0.1 and later makes this the default in all configurations, including programmatic and Spring / Spring Boot.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
使用候选名称进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
Apache Shiro 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache Shiro是美国阿帕奇（Apache）基金会的一套用于执行认证、授权、加密和会话管理的Java安全框架。 Apache Shiro 2.0.7之前版本存在安全漏洞，该漏洞源于备用名称身份验证绕过，可能导致在大小写不敏感的文件系统上绕过过滤器访问静态文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache Shiro 0 ~ 2.0.7 -

II. Public POCs for CVE-2026-23903

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III. Intelligence Information for CVE-2026-23903

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Same Patch Batch · Apache Software Foundation · 2026-02-09 · 3 CVEs total

CVE-2026-22922 Apache Airflow: Airflow externalLogUrl Permission Bypass
CVE-2026-24098 Apache Airflow: Assigning single DAG permission leaked all DAGs Import Errors

IV. Related Vulnerabilities

Same product: Apache Shiro
Same vendor: Apache Software Foundation
Same weakness: CWE-289

V. Comments for CVE-2026-23903

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