Vulnerability · Published Oct 14, 2026 · Assigned by VulnCheck

CVE-2026-110843n8n before 2.41.4 and 2.42.1 Unauthenticated Unbounded OAuth Client Persistence via Authorize Endpoint

High 8.2

In plain English

A high-severity resource allocation without limits 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)8.2High

Exploit odds (30 days)0.3%top 78.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

n8n before 2.41.4 and 2.42.x before 2.42.1 contains an uncontrolled resource consumption vulnerability in the unauthenticated OAuth authorize endpoint, which resolves clients by URL path but stores the caller's raw identifier as the record key. Unauthenticated attackers can send identifiers differing only in their query string to create unlimited first-party client records that bypass the registration cap, growing the database until the disk fills.

Affected products (as reported)

Vendor	Product	Versions
n8n-io	n8n	0 – before 2.41.42.42.0 – before 2.42.1

Weakness: CWE-770 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

GitHub Security Advisory (GHSA-3qcw-p65v-c7vq) vendor-advisory
VulnCheck Advisory: n8n before 2.41.4 and 2.42.1 Unauthenticated Unbounded OAuth Client Persistence via Authorize Endpoint third-party-advisory