CVE-2026-77070

Critical

Description

n8n before 1.123.69, 2.33.4, and 2.34.1 contains a NoSQL injection vulnerability in the MongoDB node's Find, Delete, and Aggregate operations, which parse the Query parameter as JSON after expression resolution without sanitizing MongoDB operators. An attacker who can influence the resolved query (e.g., via externally-controlled data) can inject operators such as $ne or $where, turning an intended single-document lookup into full-collection disclosure, full-collection deletion, or other operations on the database server.

SeverityCritical

CVSS9.8

Exploit probability—

Product

N8n

PublishedAug 20, 2026

First seenAug 20, 2026

Weakness typeCWE-943CWE-943

How to fix

Update

n8n n8n1.123.69, 2.33.4 or later

Vendor advisories

github.com/n8n-io/n8n/security/advisories/GHSA-953p-jm2c-8h5j

Affected products

Product	Affected versions	Fixed in
n8n n8n	v < 1.123.69, 2.33.0 ≤ v < 2.33.4, 2.34.0	1.123.69, 2.33.4

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