Vulnerability · Published Aug 20, 2026 · Assigned by VulnCheck

CVE-2026-77079n8n before 2.34.1 Authorization Bypass via Custom Role Deletion

High 7.4

In plain English

A high-severity authorization bypass via user-controlled key 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 0.5% (higher than 39% of all known vulnerabilities).

Severity (CVSS 4.0)7.4High

Exploit odds (30 days)0.5%top 60.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

n8n before 2.34.1 and 2.33.4 contains an authorization bypass in the custom project role deletion (reassignment) path. When deleting a custom project role with a reassignment target, the code validated only that the target role existed and was project-scoped, performing no project-level authorization check. A user holding only the narrow role:manageProject global scope could delete any custom project role in use on the instance and reassign its holders (including themselves) to the built-in project:admin role, gaining full administrative control of projects they had no legitimate access to.

Affected products (as reported)

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

Weakness: CWE-639 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:L/VA:L/SC:H/SI:H/SA:H

References

GitHub Security Advisory (GHSA-xhmh-8fgr-xqhj) vendor-advisory
VulnCheck Advisory: n8n before 2.34.1 Authorization Bypass via Custom Role Deletion third-party-advisory