CVE-2026-77073: n8n versions before 2.34.1 contain a credential validation bypass in the MCP create_workflow_from_code tool wh

Routine

MEDIUM 4.3UPGRADE

CVE-2026-77073 is a medium-severity flaw (CVSS 4.3) affecting n8n. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 72%)
CISA exploited list	No
Weakness	CWE-639
Published	2026-08-20
Last modified	2026-09-01

Publisher (CNA): VulnCheck · Vendor: n8n

Last updated 2026-09-01 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-20 12:16 UTCPublished CVE record published
2026-09-01 19:14 UTCUpdated Record last modified

n8n n8n UPGRADE

Affected: < 2.33.4 · 2.34.0

Fixed in: 2.33.4

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls n8n

2. UPGRADE to 2.33.4

npm install n8n@">=2.33.4"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-77073?

n8n: upgrade to 2.33.4. Exact commands for each OS are on this page.

Is CVE-2026-77073 being exploited?

CVE-2026-77073 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-77073 affect?

CVE-2026-77073 affects n8n. Severity is medium (CVSS 4.3). 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

How urgent is CVE-2026-77073?

Priority 22/100. No elevated risk signals yet.

Related CVEs

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CVE-2026-54314 HIGH 7.5 UPGRADE n8n is an open source workflow automation platform

References

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