---
cve: "CVE-2026-40976"
severity: "CRITICAL"
cvss: 9.1
epss: "49%"
vendor: "Spring"
kev: false
exploited: false
published: "2026-04-28 00:16:24"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-06T21:06:23+02:00"
---

# CVE-2026-40976

> 9.1 CRITICAL

## Beschreibung

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-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Keine | good |

## Patch verfügbar (OSV)

- 8821ad2cd381bb4b9615a61479e1de7305a8ba39 (Commit)

## Referenzen

- <https://spring.io/security/cve-2026-40976>
- <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>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-40976) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_