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CVE-2026-23903

Apache Shiro: Auth bypass when accessing static files only on case-insensitive filesystems

Published: Feb 9, 2026Updated: Feb 11, 2026 Sources: CVE List NVD GHSACWE-289
NVD MITRE
5.3CVSSMEDIUM
EPSS Score
0.4%
Top 72.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:LI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-289

Affected Products

shiroapache
LibraryLibrary
OSS Libraries / generic-library
Apache ShiroApache Software Foundation
Mixed
Web & CMS Plugins / cms-core
org.apache.shiro:shiro-springMavenOSS Libraries
apacheoss-projectUSWeb & CMS Pluginsaka apache http server, apache httpd
apache software foundationoss-projectUSWeb & CMS Pluginsaka apache foundation
mavenpackage-ecosystemOSS Libraries

Exploitability

Official Patch Available

References

https://lists.apache.org/thread/5jjf0hnjcol58z2m5y255c7scz1lnp8k
lists.apache.org
http://www.openwall.com/lists/oss-security/2026/02/08/1
openwall.com
https://nvd.nist.gov/vuln/detail/CVE-2026-23903
nvd.nist.gov
and 2 more references View all →

Timeline

Published
Feb 9, 2026
Last Updated
Feb 11, 2026

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