Parse Server
CVE-2026-30939
HIGH
GHSA-5j86-7r7m-p8h6
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessSend HTTP request to Cloud Function endpoint
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ExploitUse prototype property name as function parameter
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ExecutionTrigger infinite recursion in parser
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ImpactCrash Parse Server process
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A03:2021 - Injection
ASVS 5.0
V3 - Web Frontend Security Prototype pollution prevention
MITRE ATT&CK
2 techniques across 2 tactics: Execution, Initial Access The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Exploitation Conditions | Parse Server versions prior to 8.6.13 and 9.5.1-alpha.2 with Cloud Function endpoints enabled. No authentication required; accessible via network to default Cloud Function endpoint paths. |
| Impact | CVSS 7.5 (HIGH). Attack vector: Network. Complexity: Low. Privileges required: None. User interaction: None. Exploitation no authentication required. |
| Exploit ScenarioDerived | An attacker without authentication could exploit this vulnerability to compromise the affected system. |
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Alert meAnalysisAIv1 – Mar 12, 2026
Unauthenticated attackers can crash Parse Server instances by invoking Cloud Function endpoints with prototype property names, triggering infinite recursion and process termination. Additionally, attackers can bypass validation checks using prototype pollution techniques to elicit HTTP 200 responses for non-existent functions. All Parse Server versions prior to 8.6.13 and 9.5.1-alpha.2 are affected when the Cloud Function endpoint is exposed.
Earlier versions of this analysis (1)
Parse-Server versions up to 8.6.13 is affected by improperly controlled modification of object prototype attributes (prototype pollution) (CVSS 7.5).
RemediationAI
A vendor patch is available — apply it immediately. Fixed in version 8.6.13. Restrict network access to the affected service where possible.
Affected Packages
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
This vulnerability (CWE-1321: Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution)) affects Parse-Server. Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 8.6.13 and 9.5.1-alpha.2, an unauthenticated attacker can crash the Parse Server process by calling a Cloud Function endpoint with a prototype property name as the function name. The server recurses infinitely, causing a call stack size error that terminates the process. Other prototype property names bypass Cloud Function dispatch validation and return HTTP 200 responses, even though
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
Lifecycle Timeline
2DescriptionGitHub Advisory
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 8.6.13 and 9.5.1-alpha.2, an unauthenticated attacker can crash the Parse Server process by calling a Cloud Function endpoint with a prototype property name as the function name. The server recurses infinitely, causing a call stack size error that terminates the process. Other prototype property names bypass Cloud Function dispatch validation and return HTTP 200 responses, even though no such Cloud Functions are defined. The same applies to dot-notation traversal. All Parse Server deployments that expose the Cloud Function endpoint are affected. This vulnerability is fixed in 8.6.13 and 9.5.1-alpha.2.
Executive ViewAI
An unauthenticated attacker can crash Parse Server instances by exploiting prototype property name validation in Cloud Functions, causing service unavailability. Organizations running Parse Server versions prior to 8.6.13 or 9.5.1-alpha.2 face immediate risk of denial-of-service attacks that require process restart recovery.
Apply vendor patch. If immediate patching is not feasible: implement WAF rules to block Cloud Function requests containing prototype property names (constructor, prototype, __proto__); restrict Cloud Function endpoint access via network segmentation or IP allowlisting; disable Cloud Functions feature if not operationally required; implement request rate limiting and monitoring for repeated 200-status responses from function endpoints.
Threat Intelligence Overview
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.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.
Affected Products (CPE)GitHub Advisory
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