Improper access control in Apache Shiro - CVE-2026-56091
Published: August 24, 2026
Vulnerability identifier: #VU144904
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-56091
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass authentication.
The vulnerability exists due to improper access control in the shiro-guice module when handling a specially crafted HTTP request in a web servlet context. A remote attacker can send a specially crafted HTTP request to bypass authentication.
Only deployments using the shiro-guice module in a web servlet context are vulnerable.
Affected software
Apache Shiro
How to mitigate CVE-2026-56091
Install security update from vendor's website.
Apache Shiro - update to 3.0.0