CVE-2026-42235: n8n is an open source workflow automation platform

Q: How do I fix CVE-2026-42235?

n8n: upgrade to 1.123.32, 2.17.4. Exact commands for each OS are on this page.

Q: Is CVE-2026-42235 being exploited?

CVE-2026-42235 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-42235 affect?

CVE-2026-42235 affects n8n. Severity is critical (CVSS 9.6). n8n is an open source workflow automation platform. Prior to versions 1.123.32, 2.17.4, and 2.18.1, an unauthenticated attacker could register a malicious MCP OAuth client with a crafted client_name. If a victim user authorized the OAuth co

Q: How urgent is CVE-2026-42235?

Priority 40/100. Critical severity

This month

CRITICAL 9.6UPGRADE

CVE-2026-42235 is a critical-severity flaw (CVSS 9.6) affecting n8n. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

n8n is an open source workflow automation platform. Prior to versions 1.123.32, 2.17.4, and 2.18.1, an unauthenticated attacker could register a malicious MCP OAuth client with a crafted client_name. If a victim user authorized the OAuth consent dialog and a second user subsequently revoked that access, a toast notification would render the injected script. Clicking the link would execute arbitrary JavaScript in the victim's authenticated n8n bro

Why this priority

Critical severity

A fixed release or distro patch exists.

Risk facts

CVSS score	9.6 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 74%)
CISA exploited list	No
Weakness	CWE-79, CWE-87
Published	2026-05-04
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: n8n

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-04 19:16 UTCPublished CVE record published
2026-06-17 10:47 UTCUpdated Record last modified

n8n n8n UPGRADE

Affected: < 1.123.32 · >= 2.17.0 and < 2.17.4 · 2.18.0

Fixed in: 1.123.32, 2.17.4

Safe to downgrade to: a release before 2.17.0

1. Check installed version

npm ls n8n

2. UPGRADE to 1.123.32

npm install n8n@">=1.123.32"

3. If no update is available yet, DOWNGRADE to a release before 2.17.0

npm view n8n versions npm install n8n@"<2.17.0"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2026-42235?

n8n: upgrade to 1.123.32, 2.17.4. Exact commands for each OS are on this page.

Is CVE-2026-42235 being exploited?

CVE-2026-42235 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-2026-42235 affect?

CVE-2026-42235 affects n8n. Severity is critical (CVSS 9.6). n8n is an open source workflow automation platform. Prior to versions 1.123.32, 2.17.4, and 2.18.1, an unauthenticated attacker could register a malicious MCP OAuth client with a crafted client_name. If a victim user authorized the OAuth co

How urgent is CVE-2026-42235?

Priority 40/100. Critical severity

Related CVEs

CVE-2026-54309 CRITICAL 10.0 UPGRADE n8n is an open source workflow automation platform
CVE-2026-54310 CRITICAL 9.9 UPGRADE n8n is an open source workflow automation platform
CVE-2026-44789 CRITICAL 9.9 UPGRADE n8n is an open source workflow automation platform
CVE-2026-44791 CRITICAL 9.9 UPGRADE n8n is an open source workflow automation platform
CVE-2026-54314 HIGH 7.5 UPGRADE n8n is an open source workflow automation platform

References

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