CVE-2026-86076 n8n - Server-Side Template Injection

n8n < 1.123.76, 2.37.7, 2.38.2 contains a server-side template injection caused by improper sanitizer rebinding via reserved class member __sanitize in PrototypeSanitizer, letting attackers execute backend code and editor-preview JavaScript, exploit requires crafted expression with reserved class member.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.79% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Server-Side Template Injection
Impact
Remote Code Execution, Client Script Exec
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
8 September 2026
Updated
15 October 2026
Weakness
CWE-94

Vendor fix

Update to versions 1.123.76, 2.37.7, or 2.38.2 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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