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CVE-2026-59259

n8n - Permission Bypass via Expression Parser Mismatch in External Secrets

Published: Jul 15, 2026Updated: Jul 16, 2026 Sources: CVE List NVDCWE-639
6.5MEDIUM
NVD MITRE
EPSS Score
0.3%
Top 76.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

Description

n8n before versions 1.123.61, 2.27.4, and 2.28.1 contains a permission bypass vulnerability in external secrets handling caused by a mismatch between the static validation check and the runtime expression engine. An authenticated user with credential create or update permissions but without the externalSecret:list scope can embed external secret references into credentials in forms the static validation does not detect; these references resolve at workflow execution time, exposing secret values the user is not authorized to access. This issue only affects instances where an external secrets provider is configured and Advanced Permissions are in use.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:HI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-639

Affected Products

n8n
oss-project
n8nSaaSWeb App
Cloud & SaaS / saas-application

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Initial Access
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References

https://github.com/n8n-io/n8n/security/advisories/GHSA-jp7m-xcgx-57qm
github.com
https://www.vulncheck.com/advisories/n8n-permission-bypass-via-expression-parser-mismatch-in-external-secrets
vulncheck.com

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