CVE-2026-42235

critical

Published 2026-05-04 · Modified 2026-05-08

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CVSS v3

9.6

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:L

CVSS v4 NEW

8.8

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

VIR risk

9.6

Description

n8n Vulnerable to XSS via MCP OAuth client

Predictions

Exploit likelihood

96%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

Package impact

Ecosystem	Package	Vulnerable	Fixed
npm	n8n	`<1.123.32`	`1.123.32`
npm	n8n	`>=2.18.0,<2.18.1`	`2.18.1`
npm	n8n	`>=2.17.0,<2.17.4`	`2.17.4`
NPM	n8n	`>= 2.17.0, < 2.17.4`	`2.17.4`
NPM	n8n	`>= 2.18.0, < 2.18.1`	`2.18.1`
NPM	n8n	`< 1.123.32`	`1.123.32`

Application impact

Vendor	Product	Versions	Fixed
n8n	n8n	`{"endExcluding":"1.123.32"}`	`1.123.32`
n8n	n8n	`2.18.0`

References

CWEs

CWE-79 CWE-87

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.