# CVE-2026-40976

> Vulnerability · severity: **CRITICAL** (CVSS 9.1).

## 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 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.

## Key facts

- **CVE ID:** CVE-2026-40976
- **Published:** 2026-04-28
- **CVSS severity:** CRITICAL
- **CVSS base score:** 9.1
- **CWE codes:** CWE-862

## Affected products

- `vmware:spring_boot`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40976

## Citation

> AI Analytics. CVE-2026-40976. Retrieved 2026-06-29 from https://api.ai-analytics.org/cve/CVE-2026-40976. Derived from NIST NVD. Licensed CC0.

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