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).

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact Low

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
n8n-io n8n unaffected
Version Status Constraints
0 affected < 1.123.69
1.123.69 unaffected —
n8n-io n8n unaffected
Version Status Constraints
0 affected < 2.34.1
2.34.1 unaffected —
n8n-io n8n unaffected
Version Status Constraints
0 affected < 2.33.4
2.33.4 unaffected —

No data.

No data.

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Project Subscriptions

Vendors Products
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Advisories

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Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/n8n-io/n8n/security/advisories/GHSA-c4f6-59xq-95ww cve-icon cve-icon
https://www.vulncheck.com/advisories/n8n-before-ssrf-protection-bypass-via-oauth2 cve-icon cve-icon
History

Thu, 20 Aug 2026 11:45:00 +0000

Type Values Removed Values Added
Description 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).
Title n8n before 1.123.69 SSRF Protection Bypass via OAuth2
First Time appeared N8n
N8n n8n
Weaknesses CWE-918
CPEs cpe:2.3:a:n8n:n8n:*:*:*:*:*:*:*:*
Vendors & Products N8n
N8n n8n
References
Metrics cvssV4_0

{'score': 2.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-08-20T15:39:12.608Z

Reserved: 2026-08-20T10:51:39.783Z

Link: CVE-2026-77069

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-20T12:16:38.097

Modified: 2026-08-20T16:18:32.187

Link: CVE-2026-77069

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-20T21:30:05Z

Weaknesses