CVE-2026-103258 PUBLISHED

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

Assigner: VulnCheck
Reserved: 30.09.2026 Published: 01.10.2026 Updated: 01.10.2026

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.

CVSS Vector: 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
CVSS Score: 6.9

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	Low	Confidentiality	High
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	Present	Availability	None	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
CVSS Score: 6.8

Attack Vector	Network	Scope	Changed
Attack Complexity	High	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	None
User Interaction	None	Availability Impact	None

CVSS 3.1

Product Status

Vendor	n8n-io
Product	n8n
Versions	Default: unaffected affected from 0 to 2.39.6 (excl.) affected from 2.40.0 to 2.40.1 (excl.)

CVE-2026-103258 PUBLISHED

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

Metrics

Product Status

Credits

References

Problem Types