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 P

mediumCVSS 4CVE-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.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: medium — CVSS 4
Published: 2026-07-08
Last updated: 2026-07-08
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-56360

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-563600.19% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 8% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-56360	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

high[UPDATE] [high] n8n: Multiple vulnerabilitiescert-bund

Recent advisories for n8n

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

unknownCVE-2026-58661: n8n before 2.28.0 (and before 1.123.58 on the 1.x branch) contains a disk space exhaustion vul…nvd · 2026-07-10
mediumCVE-2026-56354: n8n before 1.123.24, 2.10.4, and 2.12.0 (across its 1.x and 2.x branches) contains cross-site …nvd · 2026-07-10
high[UPDATE] [high] n8n: Multiple vulnerabilitiescert-bund · 2026-07-10
unknownCVE-2026-59209: n8n is an open source workflow automation platform. Prior to 1.123.61, 2.27.4, and, 2.28.1, an…nvd · 2026-07-09
mediumCVE-2026-59208: n8n is an open source workflow automation platform. Prior to 2.27.4 and from 2.28.0 prior to 2…nvd · 2026-07-09
mediumCVE-2026-59207: n8n is an open source workflow automation platform. Prior to 2.27.4 and 2.28.1, the AI Agents …nvd · 2026-07-09