{"cve":"CVE-2026-23901","nvd":{"published":"2026-02-10T10:15:59.240","modified":"2026-06-17T10:22:16.960","status":"Analyzed","description":"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.","cvss_v4":{"vector":"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/S:N/AU:Y/R:A/V:C/RE:L/U:Green","score":1.0},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N","score":2.5},"cwes":["CWE-208"],"references":["https://lists.apache.org/thread/mm1jct9b86jvnh3y44tj22xvjtx3xhhh","http://www.openwall.com/lists/oss-security/2026/02/08/2"],"products":["apache:shiro"],"source":"nvd","synced_at":"2026-10-19T22:22:27.261130201+00:00"},"epss":{"cve":"CVE-2026-23901","score":0.00245,"percentile":0.15786,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-c4qc-4q9p-m9q9","url":"https://osv.dev/vulnerability/GHSA-c4qc-4q9p-m9q9","summary":"Apache Shiro Affected by an Observable Timing Discrepancy Vulnerability","modified":"2026-09-10T03:50:59.454968303Z","packages":[{"ecosystem":"Maven","name":"org.apache.shiro:shiro-core","purl":"pkg:maven/org.apache.shiro/shiro-core","ranges":["<2.1.0"],"fixed":["2.1.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}