How severe is CVE-2025-30391?

CVE-2025-30391 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-30391 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-30391?

CVE-2025-30391 affects Microsoft Dynamics 365 Customer Service. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-30391?

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-2025-30391 have an EU (EUVD) identifier?

Yes. CVE-2025-30391 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-12756.

When was CVE-2025-30391 published?

CVE-2025-30391 was published on 2025-04-30 and last updated on 2026-06-17.

CVE-2025-30391

CVE-2025-30391 is a high-severity vulnerability in Microsoft Dynamics 365 Customer Service with a CVSS 3.x base score of 8.1. 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-20.

Key facts

Severity: High (CVSS 3.x base score 8.1)
EPSS exploit prediction: 1% (60th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-12756
Weakness: CWE-20
Affected product: Microsoft Dynamics 365 Customer Service
Published: 2025-04-30
Last modified: 2026-06-17

Description

Improper input validation in Microsoft Dynamics allows an unauthorized attacker to disclose information over a network.

Frequently asked questions

What is CVE-2025-30391?: Improper input validation in Microsoft Dynamics allows an unauthorized attacker to disclose information over a network.
How severe is CVE-2025-30391?: CVE-2025-30391 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-30391 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-30391?: CVE-2025-30391 affects Microsoft Dynamics 365 Customer Service. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-30391?: 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-2025-30391 have an EU (EUVD) identifier?: Yes. CVE-2025-30391 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-12756.
When was CVE-2025-30391 published?: CVE-2025-30391 was published on 2025-04-30 and last updated on 2026-06-17.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-30391

Affected products (1)

cpe:2.3:a:microsoft:dynamics_365_customer_service:-:*:*:*:*:*:*:*

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