CVE-2026-22731: Authentication Bypass under Actuator Health groups paths

Severity: high (CVSS 8.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-03-19 · updated 2026-06-17
Weakness: CWE-288

Description

Spring Boot applications with Actuator can be vulnerable to an "Authentication Bypass" vulnerability when an application endpoint that requires authentication is declared under a specific path, already configured for a Health Group additional path. This issue affects Spring Boot: from 4.0 before 4.0.3, from 3.5 before 3.5.11, from 3.4 before 3.4.15. This CVE is similar but not equivalent to CVE-2026-22733, as the conditions for exploit and vulnerable versions are different.

Affected products

Spring Boot: from 3.4.0 before 3.4.15; from 3.5.0 before 3.5.12; from 4.0.0 before 4.0.4 — fixed in 3.4.15, 3.5.12, 4.0.4
Spring Boot: from 4.0 before 4.0.3; from 3.5 before 3.5.11; from 3.4 before 3.4.15 — fixed in 4.0.3, 3.5.11, 3.4.15

How to fix

Upgrade to a fixed version: Spring Boot 3.4.15, 3.5.12, 4.0.4; Spring Boot 4.0.3, 3.5.11, 3.4.15. Check the vendor advisory for mitigations.

References

https://spring.io/security/cve-2026-22731

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