CVE-2026-56360
CVE-2026-56360 is a medium-severity vulnerability in N8n with a CVSS 3.x base score of 4.0. The underlying weakness is classified as CWE-290.
Key facts
- Severity: Medium (CVSS 3.x base score 4.0)
- CVSS v4: 6.3
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-290
- Affected product: N8n
- Published:
- Last modified:
Description
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.
Frequently asked questions
- What is CVE-2026-56360?
- 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.
- How severe is CVE-2026-56360?
- CVE-2026-56360 has a CVSS 3.x base score of 4.0, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
- Is CVE-2026-56360 being actively exploited?
- It is not currently listed in CISA's Known Exploited Vulnerabilities catalog, and no EPSS exploit-prediction score is available yet.
- What products are affected by CVE-2026-56360?
- CVE-2026-56360 affects N8n. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-56360?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2026-56360 published?
- CVE-2026-56360 was published on 2026-07-08.
References
- https://github.com/n8n-io/n8n/security/advisories/GHSA-38c7-23hj-2wgq
- https://www.vulncheck.com/advisories/n8n-webhook-forgery-via-unsigned-post-requests-in-zendesktrigger
Affected products (1)
- cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:*
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