CVE-2026-56091 – Apache Shiro: Authentication bypass in Guice-Web integration

CVE ID :CVE-2026-56091

Published : June 25, 2026, 8:45 a.m. | 59 minutes ago

Description :When using Apache Shiro with the shiro-guice module in a web servlet context, a specially crafted HTTP request may cause an authentication bypass.
This 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.

This 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.

Upgrade to version 3.0.0 or later, which fixes the issue.

Severity: 8.2 | HIGH

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