CVE-2026-103258

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

State: Published
Severity: 6.9 Medium
Published: Oct 1, 2026
Updated: Oct 6, 2026
Reserved: Sep 30, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:N/SA:N	VulnCheck
3.1	6.8 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N	VulnCheck

Weaknesses

CWE-943 Improper Neutralization of Special Elements in Data Query Logic

Affected Products

Product	Versions
n8nn8n-io	before 2.39.6Affected 2.40.0 to before 2.40.1Affected

References

GitHub Security Advisory (GHSA-5pg9-2vqx-r6jm)vendor-advisory
VulnCheck Advisory: n8n before 2.39.6 and 2.40.x before 2.40.1 Filter Bypass via Parameter Interpolationthird-party-advisory

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