CVE-2026-56091

HIGH

Apache Shiro: Authentication bypass in Guice-Web integration

Title source: cna
STIX 2.1

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.

References (1)

Core 1
Core References

Scores

CVSS v4 8.2
EPSS 0.0042
EPSS Percentile 34.0%
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:P/AU:Y/R:X/V:D/RE:L/U:Amber

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-289
Status published
Products (2)
Apache Software Foundation/Apache Shiro < 2.99.99
Apache Software Foundation/Apache Shiro 3.0.0-alpha-0 - 3.0.0-alpha-1
Published Jun 25, 2026
Tracked Since Jun 25, 2026