What is the CVSS score of CVE-2026-30903?

CVE-2026-30903 has a CVSS 3.1 base score of 9.6 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Which versions of Microsoft are affected by CVE-2026-30903?

A critical vulnerability in Zoom Workplace (CVE-2026-30903) allows unauthenticated attackers to escalate privileges through the Mail feature, potentially compromising user accounts and sensitive…

How to fix or mitigate CVE-2026-30903?

Within 24 hours: Audit all Zoom Workplace deployments to identify affected versions and document inventory; issue communication to users restricting Mail feature usage where possible. Within 7 days: Implement network segmentation to limit Zoom Mail traffic; deploy Web Application Firewall rules to block suspicious file path manipulation attempts; consider disabling the Mail feature if business-critical alternatives exist. Within 30 days: Continuously monitor Zoom security advisories for patch availability; prepare and test patch deployment workflow; conduct post-patch security validation.

Microsoft CVE-2026-30903

CRITICAL

External Control of File Name or Path (CWE-73)

2026-03-11 security@zoom.us

Privilege Escalation Microsoft

9.6

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.6 CRITICAL

AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 22:06 vuln.today

CVE Published

Mar 11, 2026 - 15:16 nvd

CRITICAL 9.6

DescriptionCVE.org

External Control of File Name or Path in the Mail feature of Zoom Workplace for Windows before 6.6.0 may allow an unauthenticated user to conduct an escalation of privilege via network access.