n8n before versions 1.123.18 and 2.6.2 fails to verify HMAC-SHA256 signatures on Zendesk webhooks in the ZendeskTrigger node. Attackers who know the webhook URL can send unsigned POST requests to trigger workflows with arbitrary malicious data.
CVE-2026-56360
MEDIUMPre-NVD 4.04.0—Trending — 4 sources updated this week
EchelonGraph scoreHIGH confidence
Score 4.0 from GitHub Security Advisory published 2026-07-08. a secondary CVSS source baseline 4.0; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
4.0
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 4.0Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 4.0
- EG Score
- 4.0(high)
- EPSS
- 8.3%
- KEV
- Not listed
Published
July 8, 2026
Last Modified
July 8, 2026
Advisory Details (2)
Auto-updated Jul 8, 2026Patch available. Sources: github.
generic
n8n - Webhook Forgery via Unsigned POST Requests in ZendeskTrigger | Advisories | VulnCheck
https://www.vulncheck.com/advisories/n8n-webhook-forgery-via-unsigned-post-requests-in-zendesktriggergithub Patch Available
Webhook Forgery on Zendesk Trigger · Advisory · n8n-io/n8n · GitHub
https://github.com/n8n-io/n8n/security/advisories/GHSA-38c7-23hj-2wgqVendor Advisories for CVE-2026-56360(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 11× in last 7d / 11× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-07-12 05:46 UTCEPSS rescore
- 2026-07-11 12:11 UTCEG score recompute
- 2026-07-11 12:11 UTCGHSA enrichment
- 2026-07-10 12:50 UTCEG score recompute
- 2026-07-10 12:49 UTCGHSA enrichment
- 2026-07-09 19:10 UTCEPSS rescore
- 2026-07-09 19:10 UTCEPSS rescore
- 2026-07-09 13:28 UTCEG score recompute
- 2026-07-09 13:27 UTCGHSA enrichment
- 2026-07-08 14:06 UTCEG score recompute
- 2026-07-08 14:05 UTCMITRE cvelistV5first tracked
Frequently asked(5)
What is CVE-2026-56360?
CVE-2026-56360 is a medium vulnerability published on July 8, 2026. n8n before versions 1.123.18 and 2.6.2 fails to verify HMAC-SHA256 signatures on Zendesk webhooks in the ZendeskTrigger node. Attackers who know the webhook URL can send unsigned POST requests to trigger workflows with arbitrary malicious data.
When was CVE-2026-56360 disclosed?
CVE-2026-56360 was first published in the National Vulnerability Database on July 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56360 actively exploited?
CVE-2026-56360 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 8.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-56360?
CVE-2026-56360 has a CVSS v3 base score of 4.0 (NVD).
How do I remediate CVE-2026-56360?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56360, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-56360
Is Your Infrastructure Affected by CVE-2026-56360?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.