Review reviewHigh

CVE-2026-40973

Spring Spring Boot, spring boot

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` own...

CVSS: 7
EPSS: 0.14%
CISA KEV: Not listed
Published: 2026.04.28

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.14%

Technical severityCVSS 7

Vulnerability overview

Affected product and versions

Product: Spring Spring Boot, spring boot
Affected versions: >= 4.0.0 < 4.0.6, >= 3.5.0 < 3.5.14, >= 3.4.0 < 3.4.16, >= 3.3.0 < 3.3.19, >= 2.7.0 < 2.7.33, < 2.7.33
Fixed versions: 2.7.33, 3.3.19, 3.4.16, 3.5.14, 4.0.6

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that Spring Spring Boot, spring boot and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE: CWE-377