K000163434: Spring Boot vulnerability CVE-2026-40976

Security Advisory Description 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 t...

CVE-2026-40976

A flaw was found in Spring Boot. Under specific conditions, including being a servlet-based web application without custom Spring Security configuration and relying on the default web security filter chain, a remote attacker could bypass security. This allows unauthorized access to all applicatio...

CVE-2026-40976: Missing Authorization

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...

CVE-2026-40976

CVE-2026-40976 affects Spring Boot 4.0.0–4.0.5. In vulnerable configurations, a servlet-based web application that relies on Spring Boot’s default web security (no custom Spring Security config), depends on spring-boot-actuator-autoconfigure, and does not rely on spring-boot-health can experience...

CVE-2026-40976

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...

Missing Authorization

Overview Affected versions of this package are vulnerable to Missing Authorization causing web security to be ineffective and allowing unauthorized access to all endpoints. Note: This is only exploitable if the following conditions are met: - the application is servlet-based; - the application ha...