CVE-2026-110847

7.0High

Published 14 Oct 2026 · NVD status: Deferred · AI triage by gemini-3.8-flash

7.0High

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: Passive
Impact: High impact on confidentiality
Weakness: CWE-79

Impact

Authenticated workflow creators can execute arbitrary JavaScript in the browser sessions of users visiting a published Chat Trigger page on the instance origin. This lets them hijack sessions or perform actions as the signed-in visitor.

Root cause

The Chat Trigger hosted-chat page unsafely interpolates user-supplied customCss values as markup without sufficient sanitization.

Affected systems

n8n before 1.123.83, 2.x before 2.41.4, and 2.42.x before 2.42.1

CVSS v4.0 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/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

Fix & remediation

Upgrade n8n to version 1.123.83, 2.41.4, 2.42.1, or later. If upgrading immediately is not possible, disable or restrict workflows using the Chat Trigger node.

shell

$ npm update -g n8n

AI-suggested. Run it in staging first and check it against the vendor advisory. Why?

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NVD description

n8n before 1.123.83, 2.x before 2.41.4, and 2.42.x before 2.42.1 contains a stored cross-site scripting vulnerability in the Chat Trigger hosted-chat page, where insufficiently sanitised customCss values are interpolated into the page as markup. Workflow authors can publish a chat without n8n user authentication whose payload executes on the instance origin, acting on the sessions of signed-in visitors.

References

Source: nvd.nist.gov/vuln/detail/CVE-2026-110847