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CVE-2026-103250

n8n before 1.123.80, 2.39.6, and 2.40.1 NoSQL Injection via MongoDB Chat Memory

CVSS 4.0 7.0 HIGHCVSS 3.1 8.1 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-103250

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-103250

Published

n8n

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "n8n-io",
                    "product": "n8n",
                    "defaultStatus": "unaffected",
                    "packageURL": "pkg:npm/n8n",
                    "versions": [
                        {
                            "version": "0",
                            "status": "affected",
                            "versionType": "semver",
                            "lessThan": "1.123.80"
                        },
                        {
                            "version": "2.0.0",
                            "status": "affected",
                            "versionType": "semver",
                            "lessThan": "2.39.6"
                        },
                        {
                            "version": "2.40.0",
                            "status": "affected",
                            "versionType": "semver",
                            "lessThan": "2.40.1"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON