CVE-2026-56091
Published:June 25, 2026
Updated:August 04, 2026
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.
Affected Packages
https://github.com/apache/shiro.git (GITHUB):
Affected version(s) =shiro-root-3.0.0-alpha-1 <shiro-root-3.0.0Fix Suggestion:
Update to version shiro-root-3.0.0org.apache.shiro:shiro-guice (JAVA):
Affected version(s) =3.0.0-alpha-1 <3.0.0Fix Suggestion:
Update to version 3.0.0Related Resources (1)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.2
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Authentication Bypass by Alternate Name
EPSS
Base Score:
0.42