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CVE-2026-56091— Apache Shiro: Authentication bypass in Guice-Web integration

Quick assessment

Affected
Apache Software Foundation Apache Shiro
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apache shiro是美国Apache基金会开源的一个安全权限框架。 Apache Shiro 2.99.99及之前版本和3.0.0-alpha-1版本存在授权问题漏洞，该漏洞源于使用shiro-guice模块时，可能导致特制HTTP请求造成身份验证绕过。

AI Predicted 9.8 Difficulty: Easy EPSS 0.67% · P51

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
Apache Software Foundation Apache Shiro ≤ 2.99.99 affected
3.0.0-alpha-0≤ 3.0.0-alpha-1 affected
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I. Basic Information for CVE-2026-56091

Vulnerability Information
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Vulnerability Title
Apache Shiro: Authentication bypass in Guice-Web integration
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
使用候选名称进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
Apache Shiro 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache shiro是美国Apache基金会开源的一个安全权限框架。 Apache Shiro 2.99.99及之前版本和3.0.0-alpha-1版本存在授权问题漏洞，该漏洞源于使用shiro-guice模块时，可能导致特制HTTP请求造成身份验证绕过。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache Shiro 0 ~ 2.99.99 -

II. Public POCs for CVE-2026-56091

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III. Intelligence Information for CVE-2026-56091

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Mailing List Discussions for CVE-2026-56091 (1)

Same Patch Batch · Apache Software Foundation · 2026-06-25 · 7 CVEs total

CVE-2026-54226 Apache Kvrocks: RESTORE IntSet Integer Overflow Leads to Remote DoS
CVE-2026-46752 Apache Kvrocks: Stack buffer overflow in Lua bit.tohex()
CVE-2026-46751 Apache Kvrocks: Does not remove the unsafe loadstring function from its Lua sandbox, allow
CVE-2026-45188 Apache Kvrocks: Replication Fullsync Path Traversal via Unvalidated Filename Handling
CVE-2026-41566 Apache Kvrocks: Improper permission for the APPLYBATCH command
CVE-2026-56130 Apache Shiro: Remember-me cookie isn't checked for expiry on the server

IV. Related Vulnerabilities

Same product: Apache Shiro
Same vendor: Apache Software Foundation
Same weakness: CWE-289

V. Comments for CVE-2026-56091

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