When using Apache Shiro with the shiro-guice module in a web servlet context, a specially crafted HTTP request may cause an authentication bypass
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
AI Analyst Comment
Remediation
Apply vendor security updates immediately. Monitor for exploitation attempts and review access logs.
---METADATA---
VENDOR: Apache
PRODUCT: Apache Shiro
AFFECTED_VERSIONS: See vendor advisory for affected versions
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Description Summary:
Apache Shiro, when used with the shiro-guice module, is susceptible to an authentication bypass via a specially crafted HTTP request.
Executive Summary:
An authentication bypass vulnerability in Apache Shiro (shiro-guice module) allows unauthorized users to circumvent security controls, posing a high risk to application integrity.
Vulnerability Details
CVE-ID: CVE-2026-56091
Affected Software: Apache Apache Shiro
Affected Versions: See vendor advisory for affected versions
Vulnerability: An issue exists when using the shiro-guice module in a web servlet context, where a specially crafted HTTP request can bypass standard authentication checks and potentially access restricted resources.
Business Impact
This vulnerability allows attackers to bypass security boundaries, potentially leading to unauthorized access to sensitive application features or user data. With a CVSS score of 8.2, the risk is classified as High, as it undermines the fundamental authentication mechanism of the application, potentially leading to widespread unauthorized access.
Remediation Plan
Immediate Action: Apply the specific vendor-provided security patches for Apache Shiro immediately upon their release.
Proactive Monitoring: Review web server access logs for anomalous request structures or unexpected access to administrative endpoints that should have been restricted.
Compensating Controls: Utilize a WAF to inspect and filter incoming HTTP requests for patterns that attempt to manipulate servlet context routing.
Exploitation Status
Public Exploit Available: false
Analyst Notes: As of June 26, 2026, there is no public information indicating active exploitation of this vulnerability. However, due to the nature of the flaw, the potential for exploitation is high.
Analyst Recommendation
Security teams should monitor the official Apache Shiro security advisory page for the release of fixed versions. Once available, the update should be applied immediately to all instances utilizing the shiro-guice module to prevent potential authentication bypass attacks.