{"cve":"CVE-2026-23903","nvd":{"published":"2026-02-09T10:15:57.520","modified":"2026-08-20T10:16:41.287","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","score":5.3},"cwes":["CWE-289"],"references":["https://lists.apache.org/thread/5jjf0hnjcol58z2m5y255c7scz1lnp8k","http://www.openwall.com/lists/oss-security/2026/02/08/1"],"products":["apache:shiro"],"source":"nvd","synced_at":"2026-10-19T22:22:27.261130201+00:00"},"epss":{"cve":"CVE-2026-23903","score":0.00402,"percentile":0.34495,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-c244-p6m5-vqj6","url":"https://osv.dev/vulnerability/GHSA-c244-p6m5-vqj6","summary":"Apache Shiro has an Authentication Bypass","modified":"2026-09-10T03:50:59.405967778Z","packages":[{"ecosystem":"Maven","name":"org.apache.shiro:shiro-spring","purl":"pkg:maven/org.apache.shiro/shiro-spring","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."]}