Local Directory Vulnerability in Spring Boot Products
CVE-2026-40973

7HIGH

Key Information:

Vendor

Spring

Status
Spring Boot
Vendor
CVE Published:
27 April 2026

What is CVE-2026-40973?

A vulnerability exists in Spring Boot where a local attacker on the same host can gain control over the directory utilized by 'ApplicationTemp'. When the 'server.servlet.session.persistent' configuration is activated, the attacker may exploit this flaw to maintain access across application restarts. This could enable unauthorized reading of session information and ultimately lead to the hijacking of authenticated user sessions, or the execution of arbitrary code as the application's user through the deployment of a gadget chain.

Affected Version(s)

Spring Boot 4.0.0 < 4.0.6

Spring Boot 3.5.0 < 3.5.14

Spring Boot 3.4.0 < 3.4.16

References

https://spring.io/security/cve-2026-40973

CVSS V3.1

Score:
7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.