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CVE-2026-56091 is an improper-authentication vulnerability in Apache Shiro's shiro-guice module when deployed in a web servlet context. A specially crafted HTTP request can cause the application to bypass authentication controls. The issue is analogous to CVE-2020-1957, but affects shiro-guice rather than shiro-spring. Affected releases include Apache Shiro versions through the 2.x series and pre-release 3.0.0 alpha versions through 3.0.0-alpha-1 when the vulnerable module is used in a servlet deployment.
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shiro-guice module in a web servlet context until a fixed version can be deployed. Restrict external access to affected applications where feasible and review application-level access controls for sensitive endpoints. The provided content does not include any vendor-specified workaround beyond upgrading.Patch, then assume compromise.
No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An authentication bypass vulnerability in Apache Shiro's shiro-guice module when used in a web servlet context, triggered by a specially crafted HTTP request.
An authentication bypass vulnerability in Apache Shiro's shiro-guice module when used in a web servlet context, triggered by a specially crafted HTTP request.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
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