CVE-2026-103258

MEDIUMCVSS 6.8

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.

Timeline

Published:October 1st, 2026 11:17 AM

Last modified:October 6th, 2026 1:16 AM

CVSS Scoring

CVSS v3: 6.8 (MEDIUM)

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N

Weaknesses (CWE)

CWE-943

References & Reports

Advisories, patches, and third-party reports

https://github.com/n8n-io/n8n/security/advisories/GHSA-5pg9-2vqx-r6jm
https://www.vulncheck.com/advisories/n8n-before-2.39.6-and-2.40-x-before-2.40.1-filter-bypass-via-parameter-interpolation

Source: NIST NVD · Data may lag official sources by up to one minute