{"id":"CVE-2026-23903","aliases":["GHSA-c244-p6m5-vqj6"],"url":"https://o3.security/vulnerability/CVE-2026-23903","summary":"Apache Shiro has an Authentication Bypass","details":"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.","published":"2026-02-09T10:15:57.520Z","modified":"2026-04-09T02:59:17.643654Z","cvss":{"score":5.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"},"epss":{"score":0.00355,"percentile":0.29127,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"org.apache.shiro:shiro-spring","fixedVersion":"2.1.0"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://lists.apache.org/thread/5jjf0hnjcol58z2m5y255c7scz1lnp8k"},{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2026/02/08/1"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-04-09T02:59:17.643654Z"}}