CVE-2026-85167: n8n before 2.36.2 Query Injection via Elasticsearch Firestore Nodes

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-03 · updated 2026-10-29
Weakness: CWE-943

Description

n8n before 2.35.4 and 2.36.x before 2.36.2 contain a query injection vulnerability in the Elasticsearch Document Get All and Google Cloud Firestore Document Query operations, which build their JSON query by interpolating expression values directly into the query string before parsing. A value containing quote and brace characters can close the intended field and introduce new query operators, turning an intended single-document lookup into a full-collection read.

Affected products

n8n-io n8n: before 2.35.4; from 2.36.0 before 2.36.2 — fixed in 2.35.4, 2.36.2
n8n-io n8n: from 2.36.0 before 2.36.2 — fixed in 2.36.2

How to fix

Upgrade to a fixed version: n8n-io n8n 2.35.4, 2.36.2; n8n-io n8n 2.36.2. Check the vendor advisory for mitigations.

References

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