How severe is CVE-2025-30378?

CVE-2025-30378 has a CVSS 3.x base score of 7.0, rated high severity. It is exploitable over local access with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-30378 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-30378?

CVE-2025-30378 primarily affects Microsoft Sharepoint Server. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-30378?

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-2025-30378 have an EU (EUVD) identifier?

Yes. CVE-2025-30378 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-14456.

When was CVE-2025-30378 published?

CVE-2025-30378 was published on 2025-05-13 and last updated on 2026-06-17.

CVE-2025-30378

CVE-2025-30378 is a high-severity vulnerability in Microsoft Sharepoint Server 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-502.

Key facts

Severity: High (CVSS 3.x base score 7.0)
EPSS exploit prediction: 1% (63rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-14456
Weakness: CWE-502
Affected product: Microsoft Sharepoint Server
Published: 2025-05-13
Last modified: 2026-06-17

Description

Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code locally.

Frequently asked questions

What is CVE-2025-30378?: Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code locally.
How severe is CVE-2025-30378?: CVE-2025-30378 has a CVSS 3.x base score of 7.0, rated high severity. It is exploitable over local access with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-30378 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-30378?: CVE-2025-30378 primarily affects Microsoft Sharepoint Server. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-30378?: 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-2025-30378 have an EU (EUVD) identifier?: Yes. CVE-2025-30378 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-14456.
When was CVE-2025-30378 published?: CVE-2025-30378 was published on 2025-05-13 and last updated on 2026-06-17.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-30378

Affected products (3)

cpe:2.3:a:microsoft:sharepoint_server:*:*:*:*:subscription:*:*:*
cpe:2.3:a:microsoft:sharepoint_server:2016:*:*:*:enterprise:*:*:*
cpe:2.3:a:microsoft:sharepoint_server:2019:*:*:*:*:*:*:*

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