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Back to active CVEs
Medium · CVSS 5.3CVE-2026-77073

n8n before 2.34.1 Cross-Project Credential Access via MCPCVE-2026-77073

Answer in brief

CVE-2026-77073 records a Medium severity (CVSS 5.3) vulnerability in n8n before 2.34.1 Cross-Project Credential Access via MCP. The current sources do not mark it as known exploited. The current feed maps n8n-io/n8n (generic), n8n-io/n8n (generic), n8n-io/n8n (generic), n8n-io/n8n (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 20, 2026Updated Sep 1, 2026Source checked Oct 4, 2026First seen by HOL Aug 20, 2026Material review Sep 1, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 5.3
Exploitation
Not marked as known exploited
Affected software
6 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 5.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps n8n-io/n8n (generic), n8n-io/n8n (generic), n8n-io/n8n (generic), n8n-io/n8n (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:a:n8n:n8n:2.34.0:*:*:*:*:node.js:*:*Not reportedNot reported
cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
n8n-io/n8ngeneric>=0 <2.34.12.34.1
n8n-io/n8ngeneric>=0 <2.33.42.33.4
n8n-io/n8ngeneric>=2.34.0 <2.34.12.34.1
n8n-io/n8ngeneric>=2.0.0 <2.33.42.33.4

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for n8n-io/n8n, n8n-io/n8n, n8n-io/n8n.
  2. 2Review the reported fix. Update n8n-io/n8n to 2.34.1; n8n-io/n8n to 2.33.4; n8n-io/n8n to 2.34.1; n8n-io/n8n to 2.33.4 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Aug 20, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Sep 1, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Aug 20, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • Source referencevulncheck.com
Upstream source description

n8n versions before 2.34.1 contain a credential validation bypass in the MCP create_workflow_from_code tool when authentication type is set to an expression. Attackers with a valid MCP Bearer API key and knowledge of a target credential ID can persist unauthorized cross-project credential references on workflows in different projects.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Razorpay for WooCommerce < 4.8.8 - Unauthenticated Order Shipping Modification via IDORAlso CWE-639
  • Omega Solution CoinEx Crypto Customer Profile API customer authorizationAlso CWE-639
  • Omega Solution CoinEx Crypto Customer Information API customer-currency authorizationAlso CWE-639
  • WordPress TranslatePress plugin <= 3.3.6 - Cross Site Scripting (XSS) vulnerabilitySame generic ecosystem
  • WordPress Unlimited Elements For Elementor (Free Widgets, Addons, Templates) plugin <= 2.0.20 - Cross Site Scripting (XSS) vulnerabilitySame generic ecosystem
  • WordPress Gutenberg Blocks by Kadence Blocks plugin <= 3.7.11.1 - Cross Site Scripting (XSS) vulnerabilitySame generic ecosystem

Record context

Vulnerability class
Tool Poisoning
EPSS
Not reported
CWE IDs
CWE-639
Source
CVE List V5
Source checked
Oct 4, 2026
References
2 linked sources
Open source record