What is the CVSS score of CVE-2026-30966?

CVE-2026-30966 has a CVSS 3.1 base score of 10.0 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L. EPSS exploitation probability: 0.0%.

How to fix or mitigate CVE-2026-30966?

Within 24 hours: Inventory all Parse Server instances across production and non-production environments and assess exposure. Within 7 days: Apply the available vendor patch to all identified instances, prioritizing production systems, and validate patch deployment. Within 30 days: Conduct post-incident review, update change management procedures, and implement automated patch management for Parse Server dependencies.

Parse Server CVE-2026-30966

CRITICAL

Improper Access Control (CWE-284)

2026-03-10 security-advisories@github.com

GHSA-5f92-jrq3-28rc

Node.js Parse Server Parseplatform

10.0

CVSS 3.1 · GitHub Advisory

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Attack ChainAIDerived

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

Access

Send authenticated REST/GraphQL request with application key
Delivery

Access internal relation tables via API
Exploit

Modify role membership records
Execution

Inject attacker into privileged Parse Role
Impact

Execute actions with elevated permissions

Vulnerability Assessment

Weakness	CWE CWE-284 OWASP Top 10:2025 A01:2025 - Broken Access Control ASVS 5.0 V8 - Authorization Access control enforcement MITRE ATT&CK 1 technique across 1 tactic: Defense Evasion The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Exploitation Conditions	Parse Server versions prior to 9.5.2-alpha.7 (v9.x) or 8.6.20 (v8.x) with REST API or GraphQL API enabled. Attacker requires only the application key (no master key needed). Default Parse Server deployments expose internal relation tables storing role memberships to any client with the application key.
Impact	CVSS 10.0 — complete access control bypass. All data in all Parse applications is accessible.
Exploit ScenarioDerived	An attacker bypasses all access controls to read, modify, or delete any data in the Parse Server.

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

Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Parse Server has a CVSS 10.0 access control vulnerability enabling complete bypass of all data access restrictions.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 21:55 CVSS 10.0

CVSS 10.0 access control bypass in Parse Server enables unrestricted data access.

RemediationAI

Update Parse Server immediately.

Affected Packages

npm parse-server fix: 8.6.20, 9.5.2-alpha.7

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in npm

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Parse Server has a CWE-284 access control failure. CVSS 10.0 with patch.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

GitHub Advisory PRIMARY 10.0 CRITICAL

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

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

Low

Lifecycle Timeline

Patch released

Mar 11, 2026 - 19:50 nvd

Patch available

CVE Published

Mar 10, 2026 - 21:16 nvd

CRITICAL 10.0

DescriptionGitHub Advisory

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.5.2-alpha.7 and 8.6.20, Parse Server's internal tables, which store Relation field mappings such as role memberships, can be directly accessed via the REST API or GraphQL API by any client using only the application key. No master key is required. An attacker can create, read, update, or delete records in any internal relationship table. Exploiting this allows the attacker to inject themselves into any Parse Role, gaining all permissions associated with that role, including full read, write, and delete access to classes protected by role-based Class-Level Permissions (CLP). Similarly, writing to any such table that backs a Relation field used in a pointerFields CLP bypasses that access control. This vulnerability is fixed in 9.5.2-alpha.7 and 8.6.20.

Executive ViewAI

Why It Matters

A critical vulnerability (CVSS 10.0) affects Parse Server deployments, potentially allowing complete system compromise without authentication. Any organization running Parse Server as their backend infrastructure faces immediate risk of data breach, service disruption, and unauthorized access to customer information.

Business Impact: Severe

Compensating Controls

Apply vendor patch.

Threat Intelligence Overview

EPSS Score

0.0%

Top 87% exploitable

Data Quality

5 sources

Confidence: Medium

NVD

CVE.org

EPSS

GitHub

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 0.0%

Patch available Yes

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

Out-of-Cycle

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact

Very High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +50

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Affected Products (CPE)GitHub Advisory

cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:*

cpe:2.3:a:parseplatform:parse-server:9.5.2:alpha1:*:*:*:node.js:*:*

cpe:2.3:a:parseplatform:parse-server:9.5.2:alpha2:*:*:*:node.js:*:*

cpe:2.3:a:parseplatform:parse-server:9.5.2:alpha3:*:*:*:node.js:*:*

cpe:2.3:a:parseplatform:parse-server:9.5.2:alpha4:*:*:*:node.js:*:*

cpe:2.3:a:parseplatform:parse-server:9.5.2:alpha5:*:*:*:node.js:*:*

cpe:2.3:a:parseplatform:parse-server:9.5.2:alpha6:*:*:*:node.js:*:*

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Same weakness CWE-284 – Improper Access Control

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References

Advisories & patches

PATCH https://github.com/parse-community/parse-server/security/advisories/GHSA-5f92-jrq3-28rc ADVISORY https://vuldb.com/?id.350238 REF https://github.com/parse-community/parse-server/releases/tag/8.6.20 REF https://github.com/parse-community/parse-server/releases/tag/9.5.2-alpha.7

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