# CVE-2026-40973

> Vulnerability · severity: **HIGH** (CVSS 7).

## 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.

## Key facts

- **CVE ID:** CVE-2026-40973
- **Published:** 2026-04-28
- **CVSS severity:** HIGH
- **CVSS base score:** 7
- **CWE codes:** CWE-377

## Affected products

- `vmware:spring_boot`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40973

## Citation

> AI Analytics. CVE-2026-40973. Retrieved 2026-06-27 from https://api.ai-analytics.org/cve/CVE-2026-40973. Derived from NIST NVD. Licensed CC0.

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