{"id":"UBUNTU-CVE-2026-23903","details":"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.","modified":"2026-09-16T14:01:52.275829890Z","published":"2026-02-09T10:15:00Z","upstream":["CVE-2026-23903"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-23903"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-23903"},{"type":"REPORT","url":"https://www.openwall.com/lists/oss-security/2026/02/08/1"},{"type":"REPORT","url":"https://lists.apache.org/thread/5jjf0hnjcol58z2m5y255c7scz1lnp8k"},{"type":"REPORT","url":"http://www.openwall.com/lists/oss-security/2026/02/08/1"}],"affected":[{"package":{"name":"shiro","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/shiro?arch=source&distro=esm-apps%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.2.4-1","1.2.4-1ubuntu0.1~esm1","1.2.4-1ubuntu0.1~esm2"],"ecosystem_specific":{"binaries":[{"binary_name":"libshiro-java","binary_version":"1.2.4-1ubuntu0.1~esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-23903.json"}},{"package":{"name":"shiro","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/shiro?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.2-2","1.3.2-3~18.04","1.3.2-3~18.04.1","1.3.2-3ubuntu0.18.04.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.3.2-3ubuntu0.18.04.1~esm1","binary_name":"libshiro-java"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-23903.json"}},{"package":{"name":"shiro","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/shiro?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.2-4","1.3.2-4ubuntu0.1","1.3.2-4ubuntu0.2"],"ecosystem_specific":{"binaries":[{"binary_version":"1.3.2-4ubuntu0.2","binary_name":"libshiro-java"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-23903.json"}},{"package":{"name":"shiro","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/shiro?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.2-4","1.3.2-5"],"ecosystem_specific":{"binaries":[{"binary_name":"libshiro-java","binary_version":"1.3.2-5"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-23903.json"}},{"package":{"name":"shiro","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/shiro?arch=source&distro=esm-apps%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.2-5","1.3.2-5ubuntu0.24.04.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"libshiro-java","binary_version":"1.3.2-5ubuntu0.24.04.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-23903.json"}},{"package":{"name":"shiro","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/shiro?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.2-6ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_name":"libshiro-java","binary_version":"1.3.2-6ubuntu1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-23903.json"}},{"package":{"name":"shiro","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/shiro?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.2-6ubuntu1","1.3.2-6ubuntu2"],"ecosystem_specific":{"binaries":[{"binary_name":"libshiro-java","binary_version":"1.3.2-6ubuntu2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-23903.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"},{"type":"Ubuntu","score":"medium"}]}