CVE-2026-40976
CRITICAL 9.1EPSS 0.5%
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.
- Affected
- Spring · Spring Boot
- CVSS v3.1 CNA
- 9.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - EPSS
- 0.54% chance of exploitation in the next 30 days, 44th percentile
- Published
- 2026-04-27
- Updated
- 2026-07-15
Proof-of-concept exploits (1)
- madebyrokit/CVE-2026-40976-POC0★ · 2026-09-03