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Critical severity · published Apr 27, 2026
CVE-2026-40976
In certain circumstances, Spring Boot's default web security is ineffective allowing unauthorized access to all endpoints
9.1
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 42% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SB
Spring Boot · Spring
4.0.0 before 4.0.6 · source: vendor, NVD
RH
Red Hat Data Grid 8 · Red Hat
All versions, or not specified · source: CISA
Affected product
SB
Spring Boot
Spring
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-40976
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-40976
Vendor Advisory
https://spring.io/security/cve-2026-40976
access.redhat.com
https://access.redhat.com/security/cve/CVE-2026-40976
bugzilla.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2463322
security.access.redhat.com
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40976.json
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