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%.

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.

Zoom CVE-2026-30903

CRITICAL

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

2026-03-11 security@zoom.us

Privilege Escalation Zoom Microsoft Workplace Desktop Workplace Virtual Desktop Infrastructure

9.6

CVSS 3.1 · NVD

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Craft malicious network request
Exploit

Trigger file path manipulation in Mail feature
Execution

Escalate privileges through controlled file operations
Impact

Execute arbitrary code with elevated permissions

Vulnerability Assessment

Weakness	CWE CWE-73 OWASP Top 10:2025 A06:2025 - Insecure Design ASVS 5.0 V5 - File Handling File name/path control
Exploitation Conditions	Zoom Workplace for Windows versions before 6.6.0 with Mail feature enabled. User interaction required (UI:R) to click malicious link or open crafted attachment. Remote unauthenticated access over network to trigger vulnerability in Mail component.
Impact	CVSS 9.6. Zoom enterprise deployment.
Exploit ScenarioDerived	Unauthenticated user escalates via Mail feature.

Act Now Prioritize within 24-48h. Why: CRITICAL severity.

No patch listed yet 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

File path control in Zoom Workplace for Windows Mail feature before 6.6.0.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 22:06 CVSS 9.6

File path manipulation in Zoom Mail.

RemediationAI

Update Zoom.

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Technical ContextAI · show details

CWE-73.

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Exploit and PoC references, threat intelligence from 22 sources

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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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

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.

Executive ViewAI

Why It Matters

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 communications. This affects all Zoom installations running version 6.6.0 or earlier, and no patch is currently available, leaving organizations exposed until remediation is deployed.

Business Impact: Severe

Compensating Controls

Disable Zoom Mail feature if operationally feasible; implement network segmentation isolating Zoom infrastructure from critical systems; deploy WAF rules targeting file path traversal and path manipulation attacks targeting Zoom Mail endpoints; enforce strict access controls and monitoring on Zoom user accounts; restrict Zoom client deployment to managed endpoints with endpoint detection and response (EDR) enabled; monitor authentication logs for suspicious privilege escalation attempts; consider temporarily restricting Zoom usage to authenticated, corporate networks only until patch availability.

Threat Intelligence Overview

EPSS Score

0.1%

Top 84% exploitable

Data Quality

4 sources

Confidence: Medium

NVD

CVE.org

EPSS

VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity CRITICAL

CISA KEV No

Public POC No

EPSS 0.1%

Patch available No

Active threat No

Deciding rule

CRITICAL severity

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Human Impact

Very High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +48

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Privilege Escalation HIGH

Privilege escalation occurs when an attacker leverages flaws in access control mechanisms to gain permissions beyond what they were originally granted.