{"id":"GHSA-c4qc-4q9p-m9q9","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.","aliases":["CVE-2026-23901"],"modified":"2026-07-17T21:16:57.612490168Z","published":"2026-02-10T12:30:28Z","database_specific":{"nvd_published_at":"2026-02-10T10:15:59Z","cwe_ids":["CWE-208"],"severity":"LOW","github_reviewed":true,"github_reviewed_at":"2026-02-10T14:33:33Z"},"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-23901"},{"type":"PACKAGE","url":"https://github.com/apache/shiro"},{"type":"WEB","url":"https://lists.apache.org/thread/mm1jct9b86jvnh3y44tj22xvjtx3xhhh"},{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/02/08/2"}],"affected":[{"package":{"name":"org.apache.shiro:shiro-core","ecosystem":"Maven","purl":"pkg:maven/org.apache.shiro/shiro-core"},"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"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/02/GHSA-c4qc-4q9p-m9q9/GHSA-c4qc-4q9p-m9q9.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:A/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N"}]}