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CVE-2026-103258

n8n before 2.39.6 and 2.40.x before 2.40.1 Filter Bypass via Parameter Interpolation

CVSS 4.0 6.9 MEDIUMCVSS 3.1 6.8 MEDIUMCheck 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-2026-103258

Published

n8n versions before 2.39.6 and 2.40.0 before 2.40.1 contain an unescaped parameter interpolation vulnerability in SendGrid, Freshservice, and ServiceNow nodes that allows attackers to bypass filters by breaking out of query literals. Attackers can exploit this by binding vulnerable node parameters to untrusted external input to widen single-record lookups into match-all queries, exposing bulk data including contact lists, tickets, and directory entries.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-103258

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": "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