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CVE Vulnerability Details :
CVE-2026-56357
PUBLISHED
More InfoOfficial Page
Assigner-VulnCheck
Assigner Org ID-83251b91-4cc7-4094-a5c7-464a1b83ea10
View Known Exploited Vulnerability (KEV) details
Published At-22 Jun, 2026 | 21:04
Updated At-23 Jun, 2026 | 14:25
Rejected At-
▼CVE Numbering Authority (CNA)
n8n - Webhook Forgery via Missing HMAC-SHA256 Signature Verification in GitHub Webhook Trigger

n8n before 1.123.15 and 2.5.0 contains a webhook forgery vulnerability in the GitHub Webhook Trigger node that fails to implement HMAC-SHA256 signature verification. Attackers who know the webhook URL can send unsigned POST requests to trigger workflows with arbitrary data, spoofing GitHub webhook events.

Affected Products
Vendor
n8n
Product
n8n
Default Status
unaffected
Versions
Affected
  • From 0 before 1.123.15 (semver)
  • From 2.0.0 before 2.5.0 (semver)
Unaffected
  • 1.123.15 (semver)
  • 2.5.0 (semver)
Problem Types
TypeCWE IDDescription
CWECWE-290Authentication Bypass by Spoofing
Type: CWE
CWE ID: CWE-290
Description: Authentication Bypass by Spoofing
Metrics
VersionBase scoreBase severityVector
4.06.3MEDIUM
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N
3.14.0MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
Version: 4.0
Base score: 6.3
Base severity: MEDIUM
Vector:
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N
Version: 3.1
Base score: 4.0
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
reporter
simonkoeck
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/n8n-io/n8n/security/advisories/GHSA-mqpr-49jj-32rc
vendor-advisory
https://www.vulncheck.com/advisories/n8n-webhook-forgery-via-missing-hmac-sha256-signature-verification-in-github-webhook-trigger
third-party-advisory
Hyperlink: https://github.com/n8n-io/n8n/security/advisories/GHSA-mqpr-49jj-32rc
Resource:
vendor-advisory
Hyperlink: https://www.vulncheck.com/advisories/n8n-webhook-forgery-via-missing-hmac-sha256-signature-verification-in-github-webhook-trigger
Resource:
third-party-advisory
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Details not found