CVE-2026-40976: Spring Boot's default security filter chain has no authorization rule with Actuator but without Health
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.
Published Apr 28, 2026 · Updated May 6, 2026
Affected packages
org.springframework.boot:spring-boot
- Ecosystem
- Maven
- Affected
- >= 4.0.0, < 4.0.6
- Fixed in
- 4.0.6
- Check
mvn dependency:tree -Dincludes=org.springframework.boot:spring-boot
Advisory details
From the GitHub Advisory Database (CC BY 4.0).
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 4.0.0–4.0.5; upgrade to 4.0.6 or later per vendor advisory.
References
How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology