Is CVE-2026-56091 actively exploited?

No active exploitation of CVE-2026-56091 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-56091 be exploited remotely?

Yes. CVE-2026-56091 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-56091?

CVE-2026-56091 has a CVSS score of 8.2 (HIGH).

HOME VULNERABILITIESCVE-2026-56091

HIGH

CVE-2026-56091

CWE-289Published: June 25, 2026· Updated: Jun 25, 2026

8.2

CVSS v3.1

EPSS:0.42%probability of exploitation in 30 daysPercentile:33.9th

Official 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.

NVD Source

Technical Analysis

CVE-2026-56091 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionNone

ScopeP

Impact

Confidentiality

Integrity

Availability

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:P/AU:Y/R:X/V:D/RE:L/U:Amber