CVE-2026-65594
Last modified
CVE-2026-65594 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. n8n before 2.29.8 and 2.30.x before 2.30.1 (affected from 2.27.0, when the OAuth 2.1 consent and token-issuance flow was introduced) does not verify that the authenticated user has access to the workflow referenced as the OAuth resource. On instances with at least one active MCP Server Trigger workflow configured with n8n OAuth2 authentication, a member-level user can register an OAuth client, self-approve consent for another user's workflow, and obtain a valid token. EPSS estimates a 0.28% chance of exploitation in the next 30 days.
Description
n8n before 2.29.8 and 2.30.x before 2.30.1 (affected from 2.27.0, when the OAuth 2.1 consent and token-issuance flow was introduced) does not verify that the authenticated user has access to the workflow referenced as the OAuth resource. On instances with at least one active MCP Server Trigger workflow configured with n8n OAuth2 authentication, a member-level user can register an OAuth client, self-approve consent for another user's workflow, and obtain a valid token. The workflow then runs in the owner's project context with the owner's stored credentials, and the attacker can set tool inputs and read outputs (potentially including data from the owner's connected integrations), breaking user and project isolation.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:H/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| N8n | N8n | >= 2.27.0, < 2.29.8 |
| N8n | N8n | 2.30.0 |
References
- https://github.com/n8n-io/n8n/security/advisories/GHSA-q5xf-xhwf-cwqfMitigation, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-65594?
How severe is CVE-2026-65594?
How do I fix CVE-2026-65594?
How Strix Helps
- Uncovering a hidden BOLA in Appsmith's snapshot logicStrix autonomously discovered a BOLA/IDOR vulnerability in Appsmith's snapshot deletion path.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-65589n8n versions before 1.123.64 fail to properly mask custom HT…6.5
- CVE-2026-6559A weakness has been identified in Wavlink WL-WN579A3 220323.…5.3
- CVE-2026-65590n8n before 2.29.8 and 2.30.x before 2.30.1 does not enforce …9.8
- CVE-2026-65591n8n contains a sanitizer bypass vulnerability in the legacy …8.8
- CVE-2026-65592n8n before 1.123.64, 2.29.8, and 2.30.1 contains a stored DO…5.4
- CVE-2026-65593n8n versions before 1.123.64, 2.29.8, and 2.30.1 contain a s…5.4
- CVE-2026-65595n8n before 2.30.1 and 2.29.8 assigns all Public API key scop…8.8
- CVE-2026-65596n8n before 1.123.64, 2.29.8, and 2.30.1 fails to enforce the…8.1
- CVE-2026-65597n8n before 1.123.64, 2.x before 2.29.8, and before 2.30.1 co…5.4
- CVE-2026-65598n8n before 1.123.64, 2.29.8, and 2.30.1 contains a TOCTOU ra…7.5
- CVE-2026-65599n8n versions before 1.123.64, 2.29.8, and 2.30.1 contain a c…6.5
- CVE-2026-6560A security vulnerability has been detected in H3C Magic B0 u…8.8
Are you affected by CVE-2026-65594?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST