CVE-2026-56091

Apache Shiro: Authentication bypass in Guice-Web integration

State: Published
Severity: 8.2 High
Published: Jun 25, 2026
Updated: Jun 25, 2026
Reserved: Jun 18, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	8.2 High	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/S:P/AU:Y/V:D/RE:L/U:Amber	apache

Weaknesses

CWE-289 Authentication Bypass by Alternate Name

Affected Products

Product	Versions
Apache ShiroApache Software Foundation	2.99.99 and earlierAffected 3.0.0-alpha-0 through 3.0.0-alpha-1Affected

References

https://lists.apache.org/thread/onmtxmy2qonbpx7xlw3o34x8sctv47r7vendor-advisory

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