{"id":"CVE-2026-40976","aliases":["GHSA-8v8j-3hxp-93wr"],"url":"https://o3.security/vulnerability/CVE-2026-40976","summary":"Spring Boot's default security filter chain has no authorization rule with Actuator but without Health","details":"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.\n\nAffected: Spring Boot 4.0.0–4.0.5; upgrade to 4.0.6 or later per vendor advisory.","published":"2026-04-27T23:34:51.422Z","modified":"2026-08-12T03:51:25.945456964Z","cvss":{"score":9.1,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"},"epss":{"score":0.00489,"percentile":0.40334,"asOf":"2026-09-07"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"org.springframework.boot:spring-boot","fixedVersion":"4.0.6"}],"fix":null,"references":[{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40976.json"},{"type":"WEB","url":"https://spring.io/security/cve-2026-40976"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-40976"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40976.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-40976"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2463322"},{"type":"PACKAGE","url":"https://github.com/spring-projects/spring-boot"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:25.945456964Z"}}