How severe is CVE-2026-40976?

CVE-2026-40976 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-40976 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-40976?

CVE-2026-40976 affects Vmware Spring Boot. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-40976?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-40976 have an EU (EUVD) identifier?

Yes. CVE-2026-40976 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25940.

When was CVE-2026-40976 published?

CVE-2026-40976 was published on 2026-04-28 and last updated on 2026-06-30.

CVE-2026-40976

CVE-2026-40976 is a critical-severity vulnerability in Vmware Spring Boot with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-862.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
EPSS exploit prediction: 0% (39th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-25940
Weakness: CWE-862
Affected product: Vmware Spring Boot
Published: 2026-04-28
Last modified: 2026-06-30

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.

Frequently asked questions

What is CVE-2026-40976?: 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.
How severe is CVE-2026-40976?: CVE-2026-40976 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-40976 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-40976?: CVE-2026-40976 affects Vmware Spring Boot. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-40976?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-40976 have an EU (EUVD) identifier?: Yes. CVE-2026-40976 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25940.
When was CVE-2026-40976 published?: CVE-2026-40976 was published on 2026-04-28 and last updated on 2026-06-30.

References

Affected products (1)

cpe:2.3:a:vmware:spring_boot:*:*:*:*:*:*:*:*

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