Vulnerability · Published Aug 20, 2026 · Assigned by VulnCheck

CVE-2026-77069n8n before 1.123.69 SSRF Protection Bypass via OAuth2

Low 2.3

In plain English

A low-severity server-side request forgery in n8n from n8n-io. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 22% of all known vulnerabilities).

Severity (CVSS 4.0)2.3Low

Exploit odds (30 days)0.3%top 78.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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).

Affected products (as reported)

Vendor	Product	Versions
n8n-io	n8n	0 – before 1.123.69
n8n-io	n8n	2.34.0 – before 2.34.1
n8n-io	n8n	2.0.0 – before 2.33.4

Weakness: CWE-918 · 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

References

GitHub Security Advisory (GHSA-c4f6-59xq-95ww) vendor-advisory
VulnCheck Advisory: n8n before 1.123.69 SSRF Protection Bypass via OAuth2 third-party-advisory