---
id: "CVE-2026-121198"
kind: "vulnerability"
aliases: ["CVE-2026-121198"]
title: "Chrome: WebUI confused deputy lets crafted page bypass origin policy"
severity: "low"
cvss: null
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["browsers", "chrome", "endpoints", "runtime"]
not_affected_if: ["chrome-up-to-date"]
published_at: "2026-11-03T21:17:28+00:00"
first_seen_at: "2026-11-03T21:19:25+00:00"
updated_at: "2026-11-03T21:22:53+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-121198", "first_seen_at": "2026-11-03T21:19:25+00:00"}]
---

# Chrome: WebUI confused deputy lets crafted page bypass origin policy

A confused deputy flaw in the WebUI of Google Chrome before 157.0.8103.38 lets a remote attacker bypass web origin policy using a crafted HTML page. Chromium rates it Low severity and it needs social engineering to lure a user to the page.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed Chrome version in the browser's About page or with `chrome://version`.
- Confirm the version is below `157.0.8103.38`.

## Fix

- Google Chrome: move to `157.0.8103.38` or later.

## Timeline

- 2026-11-03T21:19:25+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-121198

## From the sources

Confused deputy in WebUI in Google Chrome prior to 157.0.8103.38 allowed a remote attacker leveraging social engineering to bypass web origin policy via a crafted HTML page. (Chromium security severity: Low)

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_