Advisory [CVE-2026-23903] Apache Shiro: Auth bypass when accessing static files only on case-insensitive filesystems
This security Apache Software Foundation advisory covers CVE-2026-23903 affecting Apache Shiro.
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Summary
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.
- Apache Shiro before 2.0.7
Official advisory · medium-confidence parse· fetched 2 months ago·verify at source
- 2.0.7
Official advisory · medium-confidence parse· fetched 2 months ago·verify at source
Mitigation checklist
- Users are recommended to upgrade to version 2.0.7, which fixes the issue.
Official advisory · medium-confidence parse· fetched 2 months ago·verify at source
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