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CVE-2026-42235

N8n cross-site scripting (XSS)

9.6 CRITICALEPSS 0.51%
  1. Published4 May 2026

Description

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 browser session, enabling credential and session token theft, workflow manipulation, or privilege escalation. This issue has been patched in versions 1.123.32, 2.17.4, and 2.18.1.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Affected products

N8n2.18.0 · ≥ 2.17.0 < 2.17.4 · < 1.123.32

Remediation

Fixed in
N8n≥ 2.17.4

References

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Frequently asked

Is CVE-2026-42235 being actively exploited?

CVE-2026-42235 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.51%.

How severe is CVE-2026-42235?

CVE-2026-42235 has a CVSS 3.1 base score of 9.6, rated critical. EPSS estimates a 0.51% probability of exploitation.

Which products are affected by CVE-2026-42235?

Affected products include N8n.

How do I fix CVE-2026-42235?

Upgrade affected software to a fixed version, for example N8n 2.17.4 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-42235 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.