CVE-2026-56091: CWE-289 Authentication Bypass by Alternate Name in Apache Software Foundation Apache Shiro
CVE-2026-56091 is an authentication bypass vulnerability in Apache Shiro when using the shiro-guice module in a web servlet context. It affects all versions up to and including 2.99.99 and version 3.0.0-alpha-0. The issue allows an attacker to bypass authentication via a specially crafted HTTP request. The vulnerability is fixed in Apache Shiro version 3.0.0 and later.
AI Analysis
Technical Summary
This vulnerability in Apache Shiro's shiro-guice module allows an attacker to bypass authentication in a web servlet context by sending a specially crafted HTTP request. It is similar to CVE-2020-1957 but affects the shiro-guice module instead of shiro-spring. All Apache Shiro versions through 2.x and 3.0.0-alpha-0 are affected. The issue is resolved by upgrading to version 3.0.0 or later.
Potential Impact
Successful exploitation of this vulnerability allows an unauthenticated attacker to bypass authentication controls, potentially gaining unauthorized access to protected resources. The CVSS 4.0 base score is 8.2 (high severity), indicating a significant security risk without user interaction or privileges required.
Mitigation Recommendations
Upgrade Apache Shiro to version 3.0.0 or later, which contains the fix for this authentication bypass vulnerability. No other official remediation or temporary fixes are documented. Patch status is not explicitly stated but the upgrade guidance is authoritative.
CVE-2026-56091: CWE-289 Authentication Bypass by Alternate Name in Apache Software Foundation Apache Shiro
Description
CVE-2026-56091 is an authentication bypass vulnerability in Apache Shiro when using the shiro-guice module in a web servlet context. It affects all versions up to and including 2.99.99 and version 3.0.0-alpha-0. The issue allows an attacker to bypass authentication via a specially crafted HTTP request. The vulnerability is fixed in Apache Shiro version 3.0.0 and later.
CVSS v4.0
Score 8.2high
Affected software
pkg:maven/Apache Software Foundation/org.apache.shiro:shiro-guiceRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in Apache Shiro's shiro-guice module allows an attacker to bypass authentication in a web servlet context by sending a specially crafted HTTP request. It is similar to CVE-2020-1957 but affects the shiro-guice module instead of shiro-spring. All Apache Shiro versions through 2.x and 3.0.0-alpha-0 are affected. The issue is resolved by upgrading to version 3.0.0 or later.
Potential Impact
Successful exploitation of this vulnerability allows an unauthenticated attacker to bypass authentication controls, potentially gaining unauthorized access to protected resources. The CVSS 4.0 base score is 8.2 (high severity), indicating a significant security risk without user interaction or privileges required.
Mitigation Recommendations
Upgrade Apache Shiro to version 3.0.0 or later, which contains the fix for this authentication bypass vulnerability. No other official remediation or temporary fixes are documented. Patch status is not explicitly stated but the upgrade guidance is authoritative.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- apache
- Date Reserved
- 2026-06-18T17:12:37.896Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a3cf1db4853345fc1b1afda
Added to database: 06/25/2026, 09:16:11 UTC
Last enriched: 06/25/2026, 09:30:54 UTC
Last updated: 06/25/2026, 09:34:54 UTC
Views: 6
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