CVE-2026-56091
High
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.
SeverityHigh
CVSS8.2
Exploit probability—
ProductOrg.apache.shiro:shiro-guice
PublishedJun 25, 2026
First seenJun 25, 2026
Weakness typeCWE-289CWE-289
How to fix
Update
- org.apache.shiro:shiro-guice3.0.0 or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| org.apache.shiro:shiro-guiceMaven | 2.0.0 ≤ v < 3.0.0 | 3.0.0 |
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