Authentication Bypass Vulnerability in Apache Shiro by Apache
CVE-2026-23903

5.3MEDIUM

Key Information:

Vendor

Apache
Status
Apache Shiro
Vendor
CVE Published:
9 February 2026

What is CVE-2026-23903?

An authentication bypass vulnerability exists in Apache Shiro, where users can access static files by manipulating the case of the filename in requests on case-insensitive filesystems, particularly in default setups like macOS. This flaw impacts versions before 2.0.7, where common filters might be bypassed due to insufficient case handling. To mitigate this issue, users should upgrade to version 2.0.7, which introduces a crucial parameter for addressing this vulnerability, allowing for case-insensitive configurations. The upcoming Shiro 3.0.0 version will make this configuration the default.

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Deploy the Patch

Affected Version(s)

Apache Shiro 0 < 2.0.7

References

https://lists.apache.org/thread/5jjf0hnjcol58z2m5y255c7sc...
vendor-advisory

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Jesse Yang
Lenny Pimak
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