CVE-2026-56360 json
n8n - Webhook Forgery via Unsigned POST Requests in ZendeskTrigger
published 2026-02-26 8 mo ago modified 2026-10-25 14 d ago also GHSA-38c7-23hj-2wgq , EUVD-2026-42258
- cvss
- 4.0
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 24%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- npm n8n 1.123.18, 2.6.2
- n8n n8n 1.123.18, 2.6.2
- github.com/n8n-io/n8n@3839e31 commit
- github.com/n8n-io/n8n@c6520e4 commit
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 4 mo ago
Exploit prediction
0.31% chance of exploitation in the next 30 days, higher than 24% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 6.3 | 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 |
| CNA | 3.1 | 4.0 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N |
| CNA | 4.0 | 6.3 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| GitHub | 3.1 | 4.0 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | n8n | <1.123.18 >=2.0.0, <2.6.2 |
1.123.18 2.6.2 |
Affected products
- n8n n8n
Classification
- Weakness
-
- CWE-290 Authentication Bypass by Spoofing
References
-
github.com
/n8n-io/n8n/commit/3839e310bd4c3002c646c363d1411916fa195151
web
-
github.com
/n8n-io/n8n/commit/c6520e4e87614fa60c9433e93019e211f19f65f9
web
-
github.com
/n8n-io/n8n/security/advisories/GHSA-38c7-23hj-2wgq
vendor-advisory, web, mitigation
-
vulncheck.com
/advisories/n8n-webhook-forgery-via-unsigned-post-requests-in-zendesktrigger
third-party-advisory
-
github.com
/n8n-io/n8n
package
Sources
- CVE List CVE-2026-56360
- GitHub Advisory GHSA-38c7-23hj-2wgq
- NVD CVE-2026-56360
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.