How severe is CVE-2026-40973?

CVE-2026-40973 has a CVSS 3.x base score of 7.0, rated high severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-40973 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-40973?

CVE-2026-40973 affects Vmware Spring Boot. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-40973?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-40973 have an EU (EUVD) identifier?

Yes. CVE-2026-40973 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25937.

When was CVE-2026-40973 published?

CVE-2026-40973 was published on 2026-04-28 and last updated on 2026-06-17.

CVE-2026-40973

CVE-2026-40973 is a high-severity vulnerability in Vmware Spring Boot with a CVSS 3.x base score of 7.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-377.

Key facts

Severity: High (CVSS 3.x base score 7.0)
EPSS exploit prediction: 0% (3rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-25937
Weakness: CWE-377
Affected product: Vmware Spring Boot
Published: 2026-04-28
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-40973?: 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.
How severe is CVE-2026-40973?: CVE-2026-40973 has a CVSS 3.x base score of 7.0, rated high severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-40973 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-40973?: CVE-2026-40973 affects Vmware Spring Boot. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-40973?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-40973 have an EU (EUVD) identifier?: Yes. CVE-2026-40973 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25937.
When was CVE-2026-40973 published?: CVE-2026-40973 was published on 2026-04-28 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:a:vmware:spring_boot:*:*:*:*:*:*:*:*

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