CVE-2026-77069

n8n before 1.123.69, 2.33.4, and 2.34.1 contains an SSRF protection bypass in the OAuth2 credential authorization-code-to-access-token exchange. While OAuth2 discovery and dynamic-client-registration requests use n8n's SSRF-protected HTTP client, the token exchange uses a separate client with no SSRF guard. A user with credential-creation permissions can set the access-token URL to an internal address and complete the OAuth2 flow, causing n8n to send a fixed-shape token-exchange POST to that target and reflect its response body back to the attacker (limited to what the target returns to this specific request).

CVSS v3 4.3 MEDIUM

4.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/n8n-io/n8n/security/advisories/GHSA-c4f6-59xq-95ww	Mitigation Vendor Advisory
https://www.vulncheck.com/advisories/n8n-before-ssrf-protection-bypass-via-oauth2	Third Party Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:n8n:n8n::::::node.js::*
	cpe:2.3:a:n8n:n8n::::::node.js::*
	cpe:2.3:a:n8n:n8n:2.34.0:::::node.js::

History

No history.

Information

Published : 2026-08-20 12:16

Updated : 2026-09-01 20:01

NVD link : CVE-2026-77069

Mitre link : CVE-2026-77069

CVE.ORG link : CVE-2026-77069

JSON object : View

Products Affected

n8n

n8n

CWE

CWE-918

Server-Side Request Forgery (SSRF)

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