CVE-2026-77073Network attack vector

Unauthorized credential binding via expression type mismatch

Published Aug 20, 2026 · Updated Aug 25, 2026

Authorization bypass in n8n 2.0.0 through 2.33.3 and 2.34.0 allows remote authenticated users to persist cross-project credential references. The MCP create_workflow_from_code validator treats an expression-valued authentication type as a literal key, so it misses the actual credential key and skips the cross-project ownership check. MCP must be enabled, and exploitation requires a valid MCP Bearer API key plus another project's credential ID; the reference can be stored, but runtime use and secret disclosure remain blocked.

CVSS severity5.3
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in n8n 2.0.0 through 2.33.3 and 2.34.0 allows remote authenticated users to persist cross-project credential references. The MCP create_workflow_from_code validator treats an expression-valued authentication type as a literal key, so it misses the actual credential key and skips the cross-project ownership check. MCP must be enabled, and exploitation requires a valid MCP Bearer API key plus another project's credential ID; the reference can be stored, but runtime use and secret disclosure remain blocked.

The record

CVE
CVE-2026-77073
Published
Aug 20, 2026
Updated
Aug 25, 2026
Vendor
n8n
Product
n8n
Classifications
CWE-639, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.0.0 <2.33.4
  2. Affected versionversion=2.34.0 <2.34.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

n8n · n8nversion=2.0.0 <2.33.4; version=2.34.0 <2.34.1

Published CVSS scores

5.3n8nCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key
T1565.001Stored Data Manipulation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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