CVE-2026-103250

High

Description

n8n versions before 1.123.80, from 2.0.0 before 2.39.6, and from 2.40.0 before 2.40.1 contain a NoSQL injection vulnerability in the MongoDB Chat Memory node that fails to validate the sessionId parameter. Unauthenticated attackers can supply MongoDB query operators in the sessionId field to access conversation histories from other users and perform unauthorized write and delete operations.

SeverityHigh

CVSS8.1

Exploit probability—

ProductN8n

PublishedOct 1, 2026

First seenOct 1, 2026

Weakness typeCWE-943CWE-943

How to fix

Update

n8n-io n8n1.123.80, 2.39.6, 2.40.1 or later

Vendor advisories

github.com/n8n-io/n8n/security/advisories/GHSA-w24g-6454-7w7f

Affected products

Product	Affected versions	Fixed in
n8n-io n8n	v < 1.123.80, 2.0.0 ≤ v < 2.39.6, 2.40.0 ≤ v < 2.40.1	1.123.80, 2.39.6, 2.40.1

Check your version

Choose the product and enter the version you run to see whether it falls in the affected range.

In the Intelligence 360 plan

Attack Surface Management

See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.