{"id":"CVE-2026-23903","aliases":["DEBIAN-CVE-2026-23903","EUVD-2026-6903","GHSA-c244-p6m5-vqj6","UBUNTU-CVE-2026-23903"],"status":"published","title":"Apache Shiro: Auth bypass when accessing static files only on case-insensitive filesystems","description":"Authentication Bypass by Alternate Name vulnerability in Apache Shiro.\n\nThis issue affects Apache Shiro: before 2.0.7.\n\nUsers are recommended to upgrade to version 2.0.7, which fixes the issue.\n\nThe issue only effects static files. If static files are served from a case-insensitive filesystem,\nsuch as default macOS setup, static files may be accessed by varying the case of the filename in the request.\nIf only lower-case (common default) filters are present in Shiro, they may be bypassed this way.\n\nShiro 2.1.0 and later has a new parameters to remediate this issue\nshiro.ini: filterChainResolver.caseInsensitive = true\napplication.properties: shiro.caseInsensitive=true\n\nShiro 3.0.0 and later makes this the default in shiro.ini-based configurations.\nShiro 3.0.1 and later makes this the default in all configurations, including programmatic and Spring / Spring Boot.","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-10","score":0.00397,"percentile":0.34281,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-289"],"published":"2026-02-09T09:26:21Z","modified":"2026-11-10T09:50:30Z","fixes":[{"ecosystem":"Maven","package":"org.apache.shiro:shiro-spring","fixed_in":["2.1.0"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Maven","package":"org.apache.shiro:shiro-spring","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"2.0.6"},{"fixed":"2.1.0"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"shiro","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.2-5","1.3.2-6"]},{"source":"osv","ecosystem":"Debian:13","package":"shiro","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.2-6"]},{"source":"osv","ecosystem":"Debian:14","package":"shiro","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.2-6"]},{"source":"osv","ecosystem":"Maven","package":"org.apache.shiro:shiro-spring","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.1.0"}]}],"versions":["1.0.0-incubating","1.1.0","1.10.0","1.10.1","1.11.0","1.12.0","1.13.0","1.2.0","1.2.1","1.2.2","1.2.3","1.2.4","1.2.5","1.2.6","1.3.0","1.3.1","1.3.2","1.4.0","1.4.0-RC2","1.4.1","1.4.2","1.5.0","1.5.1","1.5.2","1.5.3","1.6.0","1.7.0","1.7.1","1.8.0","1.9.0","1.9.1","2.0.0","2.0.0-alpha-1","2.0.0-alpha-2","2.0.0-alpha-3","2.0.0-alpha-4","2.0.1","2.0.2","2.0.3","2.0.4","2.0.5","2.0.6"]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"shiro","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.2.4-1","1.2.4-1ubuntu0.1~esm1","1.2.4-1ubuntu0.1~esm2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"shiro","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"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"shiro","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.2-4","1.3.2-4ubuntu0.1","1.3.2-4ubuntu0.2"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"shiro","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.2-4","1.3.2-5"]},{"source":"osv","ecosystem":"Ubuntu:Pro:24.04:LTS","package":"shiro","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.2-5","1.3.2-5ubuntu0.24.04.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"shiro","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.2-6ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"shiro","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.2-6ubuntu2"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"shiro","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.2-6ubuntu1","1.3.2-6ubuntu2"]}],"products":[{"vendor":"apache","product":"shiro"},{"vendor":"apache software foundation","product":"apache shiro"}],"references":[{"url":"https://lists.apache.org/thread/5jjf0hnjcol58z2m5y255c7scz1lnp8k","tags":["vendor-advisory","Mailing List","Vendor Advisory","advisory","web","report"]},{"url":"http://www.openwall.com/lists/oss-security/2026/02/08/1","tags":["Mailing List","Third Party Advisory","advisory","web","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-23903","tags":["advisory"]},{"url":"https://github.com/apache/shiro/commit/3b9638b957495004599aeaf24ba8949e309f26e8","tags":["web"]},{"url":"https://github.com/advisories/GHSA-c244-p6m5-vqj6"},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-23903","tags":["advisory"]},{"url":"https://github.com/apache/shiro","tags":["package"]},{"url":"https://ubuntu.com/security/CVE-2026-23903","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-23903","tags":["report"]},{"url":"https://www.openwall.com/lists/oss-security/2026/02/08/1","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-23903","title":"Apache Shiro: Auth bypass when accessing static files only on case-insensitive filesystems","description":"Authentication Bypass by Alternate Name vulnerability in Apache Shiro.\n\nThis issue affects Apache Shiro: before 2.0.7.\n\nUsers are recommended to upgrade to version 2.0.7, which fixes the issue.\n\nThe issue only effects static files. If static files are served from a case-insensitive filesystem,\nsuch as default macOS setup, static files may be accessed by varying the case of the filename in the request.\nIf only lower-case (common default) filters are present in Shiro, they may be bypassed this way.\n\nShiro 2.1.0 and later has a new parameters to remediate this issue\nshiro.ini: filterChainResolver.caseInsensitive = true\napplication.properties: shiro.caseInsensitive=true\n\nShiro 3.0.0 and later makes this the default in shiro.ini-based configurations.\nShiro 3.0.1 and later makes this the default in all configurations, including programmatic and Spring / Spring Boot.","status":"published","published":"2026-02-09T09:26:21.772Z","modified":"2026-11-10T09:50:30.969Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"adp"}],"cwes":["CWE-289"],"updated_at":"2026-11-10T10:38:07.767755Z"}],"euvd":[{"id":"EUVD-2026-6903","description":"Authentication Bypass by Alternate Name vulnerability in Apache Shiro.\n\nThis issue affects Apache Shiro: before 2.0.7.\n\nUsers are recommended to upgrade to version 2.0.7, which fixes the issue.\n\nThe issue only effects static files. If static files are served from a case-insensitive filesystem,\nsuch as default macOS setup, static files may be accessed by varying the case of the filename in the request.\nIf only lower-case (common default) filters are present in Shiro, they may be bypassed this way.\n\nShiro 2.1.0 and later has a new parameters to remediate this issue\nshiro.ini: filterChainResolver.caseInsensitive = true\napplication.properties: shiro.caseInsensitive=true\n\nShiro 3.0.0 and later makes this the default in shiro.ini-based configurations.\nShiro 3.0.1 and later makes this the default in all configurations, including programmatic and Spring / Spring Boot.","status":"published","published":"2026-02-09T09:26:21Z","modified":"2026-11-10T09:50:30Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"updated_at":"2026-11-10T11:20:44.549296Z"}],"ghsa":[{"id":"GHSA-c244-p6m5-vqj6","title":"Apache Shiro has an Authentication Bypass","description":"### Impact\n\n**Authentication Bypass:**\nA vulnerability exists in Apache Shiro that allows authentication bypass for static files when served from a case-insensitive filesystem (such as the default configuration on macOS or Windows).\n\nThe issue arises when Shiro's URL filters are configured with lower-case rules (a common default), but the underlying operating system treats mixed-case filenames as identical. An attacker can access protected static resources by varying the capitalization of the filename in the request (e.g., requesting `/SECRET.TXT` to bypass a rule for `/secret.txt`).\n\nThis issue specifically affects static file handling and does not impact dynamic resource paths that are case-sensitive.\n\n### Patches\nUsers should upgrade to Apache Shiro **2.1.0** or later.\n\n**Important Configuration Note:**\nVersion 2.1.0 introduces a new configuration parameter to handle case-insensitivity, which must be enabled manually to resolve the issue:\n\n* **shiro.ini:**\n    ```ini\n    filterChainResolver.caseInsensitive = true\n    ```\n* **Spring Boot (application.properties):**\n    ```properties\n    shiro.caseInsensitive=true\n    ```\n\n*Note: Apache Shiro 3.0.0 (upcoming) will enable this setting by default.*\n\n### Workarounds\n* Ensure that the filesystem hosting the application is case-sensitive (e.g., Linux/Unix).\n* Manually configure all Shiro filter chains to handle all possible case variations of protected filenames (not recommended due to complexity).\n\n### Resources\n* [CVE-2026-23903](https://nvd.nist.gov/vuln/detail/CVE-2026-23903)\n* [Mailing List Announcement](https://lists.apache.org/thread/5jjf0hnjcol58z2m5y255c7scz1lnp8k)\n* [OSS-Security List](http://www.openwall.com/lists/oss-security/2026/02/08/1)","status":"published","published":"2026-02-09T12:30:22Z","modified":"2026-02-11T19:48:44Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"cwes":["CWE-289"],"updated_at":"2026-11-02T14:39:24.742346Z"}],"nvd":[{"id":"CVE-2026-23903","description":"Authentication Bypass by Alternate Name vulnerability in Apache Shiro.\n\nThis issue affects Apache Shiro: before 2.0.7.\n\nUsers are recommended to upgrade to version 2.0.7, which fixes the issue.\n\nThe issue only effects static files. If static files are served from a case-insensitive filesystem,\nsuch as default macOS setup, static files may be accessed by varying the case of the filename in the request.\nIf only lower-case (common default) filters are present in Shiro, they may be bypassed this way.\n\nShiro 2.1.0 and later has a new parameters to remediate this issue\nshiro.ini: filterChainResolver.caseInsensitive = true\napplication.properties: shiro.caseInsensitive=true\n\nShiro 3.0.0 and later makes this the default in shiro.ini-based configurations.\nShiro 3.0.1 and later makes this the default in all configurations, including programmatic and Spring / Spring Boot.","status":"published","published":"2026-02-09T10:15:57.52Z","modified":"2026-08-20T10:16:41.287Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-289"],"updated_at":"2026-11-02T14:12:05.52517Z"}],"osv":[{"id":"CVE-2026-23903","description":"Authentication Bypass by Alternate Name vulnerability in Apache Shiro.\n\nThis issue affects Apache Shiro: before 2.0.7.\n\nUsers are recommended to upgrade to version 2.0.7, which fixes the issue.\n\nThe issue only effects static files. If static files are served from a case-insensitive filesystem,\nsuch as default macOS setup, static files may be accessed by varying the case of the filename in the request.\nIf only lower-case (common default) filters are present in Shiro, they may be bypassed this way.\n\nShiro 2.0.7 and later has a new parameters to remediate this issue\nshiro.ini: filterChainResolver.caseInsensitive = true\napplication.propertie: shiro.caseInsensitive=true\n\nShiro 3.0.0 and later (upcoming) makes this the default.","status":"published","published":"2026-02-09T10:15:57.52Z","modified":"2026-04-09T02:59:17.643654Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:59.079784Z"},{"id":"DEBIAN-CVE-2026-23903","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 2.1.0 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.","status":"published","published":"2026-02-09T10:15:57.52Z","modified":"2026-10-05T04:00:11.240295986Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:45:53.516942Z"},{"id":"GHSA-c244-p6m5-vqj6","title":"Apache Shiro has an Authentication Bypass","description":"### Impact\n\n**Authentication Bypass:**\nA vulnerability exists in Apache Shiro that allows authentication bypass for static files when served from a case-insensitive filesystem (such as the default configuration on macOS or Windows).\n\nThe issue arises when Shiro's URL filters are configured with lower-case rules (a common default), but the underlying operating system treats mixed-case filenames as identical. An attacker can access protected static resources by varying the capitalization of the filename in the request (e.g., requesting `/SECRET.TXT` to bypass a rule for `/secret.txt`).\n\nThis issue specifically affects static file handling and does not impact dynamic resource paths that are case-sensitive.\n\n### Patches\nUsers should upgrade to Apache Shiro **2.1.0** or later.\n\n**Important Configuration Note:**\nVersion 2.1.0 introduces a new configuration parameter to handle case-insensitivity, which must be enabled manually to resolve the issue:\n\n* **shiro.ini:**\n    ```ini\n    filterChainResolver.caseInsensitive = true\n    ```\n* **Spring Boot (application.properties):**\n    ```properties\n    shiro.caseInsensitive=true\n    ```\n\n*Note: Apache Shiro 3.0.0 (upcoming) will enable this setting by default.*\n\n### Workarounds\n* Ensure that the filesystem hosting the application is case-sensitive (e.g., Linux/Unix).\n* Manually configure all Shiro filter chains to handle all possible case variations of protected filenames (not recommended due to complexity).\n\n### Resources\n* [CVE-2026-23903](https://nvd.nist.gov/vuln/detail/CVE-2026-23903)\n* [Mailing List Announcement](https://lists.apache.org/thread/5jjf0hnjcol58z2m5y255c7scz1lnp8k)\n* [OSS-Security List](http://www.openwall.com/lists/oss-security/2026/02/08/1)","status":"published","published":"2026-02-09T12:30:22Z","modified":"2026-09-10T03:50:59.405967778Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"cwes":["CWE-289"],"updated_at":"2026-11-02T15:46:44.225359Z"},{"id":"UBUNTU-CVE-2026-23903","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 2.1.0 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.","status":"published","published":"2026-02-09T10:15:00Z","modified":"2026-10-28T20:16:03.193283376Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T16:56:04.456047Z"}]}}