CVE-2026-40976

Summary

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 Software

Weaknesses

• CWE-862: CWE-862: Missing Authorization

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: total

Spring Boot: Spring Boot: Security bypass due to ineffective default web security

Additional References

• https://access.redhat.com/security/cve/CVE-2026-40976
• https://bugzilla.redhat.com/show_bug.cgi?id=2463322
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40976.json

References

• https://spring.io/security/cve-2026-40976

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