Is CVE-2026-40976 actively exploited?

No active exploitation of CVE-2026-40976 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-40976 be exploited remotely?

Yes. CVE-2026-40976 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-40976?

CVE-2026-40976 has a CVSS score of 9.1 (CRITICAL).

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CRITICAL

CVE-2026-40976

CWE-862Published: April 28, 2026· Updated: Apr 30, 2026

9.1

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:10.5th

Official 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.

NVD Source

Technical Analysis

CVE-2026-40976 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), with a CVSS base score of 9.1.