High severity8.1NVD Advisory· Published Oct 1, 2026· Updated Oct 1, 2026

CVE-2026-103250

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.

Affected products

N8n Io/N8nllm-fuzzy
Range: <1.123.80, 2.0.0-<2.39.6, 2.40.0-<2.40.1

Patches

Vulnerability mechanics

References

github.com/n8n-io/n8n/security/advisories/GHSA-w24g-6454-7w7fnvd
www.vulncheck.com/advisories/n8n-before-1.123.80-2.39.6-and-2.40.1-nosql-injection-via-mongodb-chat-memorynvd

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