CVE-2026-40973 Security Details

CVE ID

CVE-2026-40973

CWE

CWE-377

CVE Description

A local attacker on the same host as the application may be able to take control of the directory used by `ApplicationTemp`. When `server.servlet.session.persistent` is set to `true` and the attack persists across application restarts, this may allow the attacker to read session information and hijack authenticated users or deploy a gadget chain and execute code as the application's user. Affected: Spring Boot 4.0.0–4.0.5 (fix 4.0.6), 3.5.0–3.5.13 (fix 3.5.14), 3.4.0–3.4.15 (fix 3.4.16), 3.3.0–3.3.18 (fix 3.3.19), 2.7.0–2.7.32 (fix 2.7.33); predictable temp directory / `ApplicationTemp` ownership verification. Versions that are no longer supported are also affected per vendor advisory.

Published

Apr 27, 2026

CVSS Score & Severity

8.5High

CVSS Vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

EPSS Score

0.016%

Malware

malware

KEV Status

Not in KEV Catalog: No known exploits

Vulnerable Methods

org/springframework/boot/ApplicationTemp.getDir()Ljava/io/File;

JVM

org/springframework/boot/ApplicationTemp.getDir(Ljava/lang/String;)Ljava/io/File;

JVM

org/springframework/boot/system/ApplicationTemp.createDirectory(Ljava/nio/file/Path;)Ljava/nio/file/Path;

JVM

org/springframework/boot/system/ApplicationTemp.getDir()Ljava/io/File;

JVM

org/springframework/boot/system/ApplicationTemp.getDir(Ljava/lang/String;)Ljava/io/File;

JVM

Affected Ecosystems

affected

Source

National Vulnerability Database

References

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