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CVE-2026-29793

CRITICAL CVSS 4.0: 9.3 EPSS 0.02%
Updated Mar 19, 2026
FeathersJS
Parameter Value
CVSS 9.3 (CRITICAL)
Affected Versions 5.0.0 — 5.0.42
Fixed In 5.0.42
Type CWE-943
Vendor FeathersJS
Public PoC No

Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript. From 5.0.0 to before 5.0.42, Socket.IO clients can send arbitrary JavaScript objects as the id argument to any service method (get, patch, update, remove). The transport layer performs no type checking on this argument.

When the service uses the MongoDB adapter, these objects pass through getObjectId() and land directly in the MongoDB query as operators. Sending {$ne: null} as the id matches every document in the collection. This vulnerability is fixed in 5.0.42.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service

CVSS Vector v4.0

Weakness Type (CWE)

Vulnerable Products 1

Configuration From (including) Up to (excluding)
Feathersjs Feathers
cpe:2.3:a:feathersjs:feathers:*:*:*:*:*:node.js:*:*
5.0.0 5.0.42

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