{"id":"CVE-2026-23901","aliases":["GHSA-c4qc-4q9p-m9q9"],"url":"https://o3.security/vulnerability/CVE-2026-23901","summary":"Apache Shiro Affected by an Observable Timing Discrepancy Vulnerability","details":"Observable Timing Discrepancy vulnerability in Apache Shiro.\n\nThis issue affects Apache Shiro: from 1.*, 2.* before 2.0.7.\n\nUsers are recommended to upgrade to version 2.0.7 or later, which fixes the issue.\n\nPrior to Shiro 2.0.7, code paths for non-existent vs. existing users are different enough,\nthat a brute-force attack may be able to tell, by timing the requests only, determine if\nthe request failed because of a non-existent user vs. wrong password.\n\nThe most likely attack vector is a local attack only.\nShiro security model  https://shiro.apache.org/security-model.html#username_enumeration  discusses this as well.\n\nTypically, brute force attack can be mitigated at the infrastructure level.","published":"2026-02-10T10:15:59.240Z","modified":"2026-03-13T04:09:37.721434Z","cvss":{"score":2.5,"severity":"LOW","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"org.apache.shiro:shiro-core","fixedVersion":"2.1.0"}],"fix":null,"references":[{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2026/02/08/2"},{"type":"REPORT","url":"https://lists.apache.org/thread/mm1jct9b86jvnh3y44tj22xvjtx3xhhh"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-03-13T04:09:37.721434Z"}}