Vulnerability in N8n-Io N8n
CVE-2026-103258
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/n8n-io/n8n/security/advisories/GHSA-5pg9-2vqx-r6jm (vendor-advisory)
- www.vulncheck.com/advisories/n8n-before-2.39.6-and-2.40-x-before-2.40.1-filter-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-103258?
- CVE-2026-103258 is a medium-severity vulnerability in N8n-Io N8n, classified under Improper Neutralization of Special Elements in Data Query Logic. CVSS score: 6.8/10. Published 2026-10-01.
- How severe is CVE-2026-103258?
- Medium severity. CVSS v3 base score is 6.8 out of 10.