CVE-2026-56349Network attack vector

Guardrail instruction bypass via crafted end-user input

Published Jul 15, 2026 · Updated Jul 15, 2026

Improper input validation in the Guardrail node in n8n before 2.10.0 allows remote attackers to bypass configured workflow safeguards. The node accepts crafted end-user text that circumvents its default guardrail instructions; n8n has not disclosed the specific parsing or validation error. Exploitation requires a reachable workflow that uses the Guardrail node, and the demonstrated consequence is reduced workflow integrity rather than data disclosure or service interruption.

CVSS severity6.3
Medium
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in the Guardrail node in n8n before 2.10.0 allows remote attackers to bypass configured workflow safeguards. The node accepts crafted end-user text that circumvents its default guardrail instructions; n8n has not disclosed the specific parsing or validation error. Exploitation requires a reachable workflow that uses the Guardrail node, and the demonstrated consequence is reduced workflow integrity rather than data disclosure or service interruption.

The record

CVE
CVE-2026-56349
Published
Jul 15, 2026
Updated
Jul 15, 2026
Vendor
n8n
Product
n8n
Classifications
CWE-20
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2.10.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

n8n · n8nversion=0 <2.10.0

Published CVSS scores

6.3VulnCheck CNACVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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