Spring Boot 4.0.5 Default Security Filter Chain Bypass
CVE-2026-40976 Published on April 27, 2026

In certain circumstances, Spring Boot's default web security is ineffective allowing unauthorized access to all endpoints. For an application to be vulnerable, it must: be a servlet-based web application; have no Spring Security configuration of its own and rely on the default web security filter chain; depend on spring-boot-actuator-autoconfigure; not depend on spring-boot-health. If any of the above does not apply, the application is not vulnerable. Affected: Spring Boot 4.0.04.0.5; upgrade to 4.0.6 or later per vendor advisory.

NVD

Vulnerability Analysis

CVE-2026-40976 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality and integrity, and no impact on availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
HIGH
Availability Impact:
NONE

Weakness Types

What is an AuthZ Vulnerability?

The software does not perform an authorization check when an actor attempts to access a resource or perform an action.

CVE-2026-40976 has been classified to as an AuthZ vulnerability or weakness.

Authentication Bypass by Primary Weakness

The authentication algorithm is sound, but the implemented mechanism can be bypassed as the result of a separate weakness that is primary to the authentication error.


Products Associated with CVE-2026-40976

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2026-40976 are published in these products:

VMware Spring Framework
 
Red Hat Jboss Data Grid
 
Red Hat Amq Broker
 
Red Hat Amq Clients
 
Red Hat Apache Camel Hawtio
 
Red Hat Camel Spring Boot
 
Red Hat Optaplanner
 
Red Hat Enterprise Linux (RHEL)
 
Red Hat Jboss Fuse
 
Red Hat Jboss Enterprise Application Platform
 
Red Hat Jbosseapxp
 
Red Hat Openshift Devspaces
 
Red Hat Jboss Enterprise Bpms Platform
 
Red Hat Single Sign On
 

Affected Versions

Spring Boot: Red Hat Data Grid 8: Red Hat AMQ Broker 7: Red Hat AMQ Clients: Red Hat build of Apache Camel - HawtIO 4: Red Hat build of Apache Camel for Spring Boot 4: Red Hat build of OptaPlanner 8: Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 9: Red Hat Fuse 7: Red Hat JBoss Enterprise Application Platform 7: Red Hat JBoss Enterprise Application Platform 8: Red Hat JBoss Enterprise Application Platform Expansion Pack: Red Hat OpenShift Dev Spaces: Red Hat Process Automation 7: Red Hat Single Sign-On 7:

Exploit Probability

EPSS
0.41%
Percentile
32.79%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.