# CVE-2026-56091

## Summary

- **CVE ID:** CVE-2026-56091
- **Severity:** HIGH
- **CVSS Score:** 8.2 (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)
- **CWE:** CWE-289
- **Published:** Jun 25, 2026
- **Last Modified:** Jun 25, 2026

## 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.

## Affected Products

- Apache Software Foundation — Apache Shiro (0)
- Apache Software Foundation — Apache Shiro (3.0.0-alpha-0)

## References

- [CNA](https://lists.apache.org/thread/onmtxmy2qonbpx7xlw3o34x8sctv47r7)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.67%
- **EPSS Percentile:** 49.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._