CVE-2026-56091

Apache Shiro: Authentication bypass in Guice-Web integration

Assigner: apache
Reserved: 18.06.2026 Published: 25.06.2026 Updated: 25.06.2026

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.

Metrics

CVSS Vector: 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
CVSS Score: 8.2

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	Present	Availability	None	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	Apache Software Foundation
Product	Apache Shiro
Versions	Default: unaffected affected from 0 to 2.99.99 (incl.) affected from 3.0.0-alpha-0 to 3.0.0-alpha-1 (incl.)

Vendor

Apache Software Foundation

Product

Apache Shiro

Versions

Default: unaffected

affected from 0 to 2.99.99 (incl.)
affected from 3.0.0-alpha-0 to 3.0.0-alpha-1 (incl.)

Credits

LocalHost <localhost.detect@gmail.com> finder
Lenny Primak <lenny@flowlogix.com> remediation developer

References

Problem Types