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      <title>CVE-2026-56091 — Apache Shiro: Authentication bypass in Guice-Web integration</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-56091</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Apache Software Foundation Apache Shiro&lt;/p&gt;
&lt;p&gt;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.&lt;/p&gt;
&lt;p&gt;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.&lt;/p&gt;
&lt;p&gt;Upgrade to version 3.0.0 or later, which fixes the issue.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Apache Software Foundation Apache Shiro&lt;/p&gt;
&lt;p&gt;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.&lt;/p&gt;
&lt;p&gt;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.&lt;/p&gt;
&lt;p&gt;Upgrade to version 3.0.0 or later, which fixes the issue.&lt;/p&gt;</content:encoded>
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