{"schema_version": "1.6.1", "id": "CVE-2026-56091", "summary": "Authentication bypass in Guice-Web integration", "details": "When using Apache Shiro with the shiro-guice module in a web servlet context, a specially crafted HTTP request may cause an authentication bypass.\nThis vulnerability is similar to  https://www.cve.org/CVERecord?id=CVE-2020-1957 https://www.cve.org/CVERecord , except that it affects the `shiro-guice` module instead of the `shiro-spring` module.\n\nThis issue affects all Apache Shiro versions through 2.x, and 3.0.0-alpha-1 only when using `shiro-guice` module in a web servlet context.\n\nUpgrade to version 3.0.0 or later, which fixes the issue.", "affected": [{"ranges": [{"type": "SEMVER", "events": [{"introduced": "0"}, {"last_affected": "0"}]}, {"type": "SEMVER", "events": [{"introduced": "3.0.0-alpha-0"}, {"last_affected": "3.0.0-alpha-0"}]}]}], "references": [{"type": "WEB", "url": "https://lists.apache.org/thread/onmtxmy2qonbpx7xlw3o34x8sctv47r7"}]}