High severity · published Oct 28, 2026
CVE-2026-118648
n8n before 1.123.85, 2.43.5, and 2.44.1 Stored XSS via Webhook Responses Missing Sandbox Policy
New
7.3
CVSS
–
EPSS
No
On KEV
Description
n8n before 1.123.85, 2.x before 2.43.5, and 2.44.x before 2.44.1 contains a stored cross-site scripting vulnerability because some webhook response paths, such as error responses and responses without headers, omit the sandbox Content-Security-Policy. Authenticated members who can create and activate workflows can serve HTML that runs on the n8n origin, letting scripts act with the session of users who open the webhook URL.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
N8
n8n · n8n-io
before 1.123.85; 2.44.0 before 2.44.1; 2.0.0 before 2.43.5 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-118648
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-118648
vendor-advisory
https://github.com/n8n-io/n8n/security/advisories/GHSA-mp7q-23hg-35cf
third-party-advisory
https://www.vulncheck.com/advisories/n8n-before-1.123.85-2.43.5-and-2.44.1-stored-xss-via-webhook-responses-missing-sandbox-policy
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