---
id: CVE-2026-23903
title: |-
  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
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 st…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'
cwe:
  - CWE-289
vendor: apache
product: shiro
affected:
  - shiro < 2.0.7
patched:
  - shiro 2.0.7
published: '2026-02-09'
updated: '2026-08-20'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-23903'
references:
  - url: 'https://lists.apache.org/thread/5jjf0hnjcol58z2m5y255c7scz1lnp8k'
    label: security@apache.org
  - url: 'http://www.openwall.com/lists/oss-security/2026/02/08/1'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.00355
epssPercentile: 0.29318
ingestedAt: '2026-08-20T17:59:03.927Z'
---

## Overview

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.

## Affected

- `shiro < 2.0.7`

## Remediation

Upgrade past the affected range:

- `shiro 2.0.7`