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

CVE ID : CVE-2026-23903

Published : Feb. 9, 2026, 10:15 a.m. | 1 hour, 3 minutes ago

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 2.0.7 and later has a new parameters to remediate this issue
shiro.ini: filterChainResolver.caseInsensitive = true
application.propertie: shiro.caseInsensitive=true

Shiro 3.0.0 and later (upcoming) makes this the default.

Severity: 0.0 | NA

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