GHSA-m63j-689w-3j35 — high GitHub Advisory (CVE-2026-33663) in npm/n8n

Description

Impact

An authenticated user with the global:member role could exploit chained authorization flaws in n8n's credential pipeline to steal plaintext secrets from generic HTTP credentials (httpBasicAuth, httpHeaderAuth, httpQueryAuth) belonging to other users on the same instance.

The attack abuses a name-based credential resolution path that does not enforce ownership or project scope, combined with a bypass in the credentials permission checker that causes generic HTTP credential types to be skipped during pre-execution validation. Together, these flaws allow a member-role user to resolve another user's credential ID and execute a workflow that decrypts and uses that credential without authorization.

Native integration credential types (e.g. slackApi, openAiApi, postgres) are not affected by this issue.

This vulnerability affects Community Edition only. Enterprise Edition has additional permission gates on workflow creation and execution that independently block this attack chain.

Patches

The issue has been fixed in n8n versions 1.123.27, 2.13.3, and 2.14.1. Users should upgrade to one of these versions or later to remediate the vulnerability.

Workarounds

If upgrading is not immediately possible, administrators should consider the following temporary mitigations:
- Restrict instance access to fully trusted users only.
- Audit credentials stored on the instance and rotate any generic HTTP credentials (httpBasicAuth, httpHeaderAuth, httpQueryAuth) that may have been exposed.

These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.

Basic information

Type: reviewed
Severity: high
Advisory on GitHub: Open advisory ↗
Repository advisory: Open repository advisory ↗
Source code: Browse source ↗
Published (advisory): 2026-03-25 21:08:33 UTC
Updated: 2026-03-25 21:08:34 UTC
GitHub reviewed: 2026-03-25 21:08:33 UTC
NVD published: 2026-03-25

Score	Percentile
0.02%	5.04%

CVSS Scores

Base score	Version	Severity	Vector
10.0	3.1	—	`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:L) A normal user session is enough; they don’t have to be admin. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:C) Breaking this can reach past the original component and bite other resources—bigger blast radius. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.
8.5	4.0	—	`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:H/SA:H` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network. Attack complexity (AC:L) Exploitation conditions are straightforward and stable. Attack requirements (AT:N) No additional preconditions are required beyond normal reachability. Privileges required (PR:L) Low privileges are required. User interaction (UI:N) No user interaction is required. Vulnerable system confidentiality impact (VC:H) High confidentiality impact on the vulnerable system. Vulnerable system integrity impact (VI:N) No integrity impact on the vulnerable system. Vulnerable system availability impact (VA:N) No availability impact on the vulnerable system. Subsequent system confidentiality impact (SC:H) High confidentiality impact on subsequent systems. Subsequent system integrity impact (SI:H) High integrity impact on subsequent systems. Subsequent system availability impact (SA:H) High availability impact on subsequent systems.

Identifiers

Type	Value
GHSA	GHSA-m63j-689w-3j35 ↗
CVE	CVE-2026-33663 ↗

CWEs

CWE id	Name
CWE-639	Authorization Bypass Through User-Controlled Key

Credits

tr4ce-ju (reporter)

Affected packages (3)

Vulnerable version ranges and first patched releases as published by GitHub.

Ecosystem	Package	Vulnerable range	First patched	Vulnerable functions
npm	n8n	< 1.123.27	1.123.27	—
npm	n8n	= 2.14.0	2.14.1	—
npm	n8n	>= 2.0.0-rc.0, < 2.13.3	2.13.3	—

n8n is Vulnerable to Credential Theft via Name-Based Resolution and Permission Checker Bypass in Community Edition