---
id: "CVE-2026-121142"
kind: "vulnerability"
aliases: ["CVE-2026-121142"]
title: "Chrome: network authorization flaw lets a crafted extension bypass web origin policy"
severity: "low"
cvss: null
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["browser", "chrome", "linux", "macos", "package", "windows"]
not_affected_if: ["chrome-up-to-date", "no-extensions-installed"]
published_at: "2026-11-03T21:17:22+00:00"
first_seen_at: "2026-11-03T21:19:22+00:00"
updated_at: "2026-11-03T21:24:39+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-121142", "first_seen_at": "2026-11-03T21:19:22+00:00"}]
---

# Chrome: network authorization flaw lets a crafted extension bypass web origin policy

Google Chrome before 157.0.8103.38 has an incorrect authorization check in its Network component. A remote attacker who tricks a user into installing a crafted Chrome extension can bypass web origin policy.

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

## How to check

- Check the installed Chrome version at chrome://settings/help and compare it with `157.0.8103.38`.
- Review installed extensions at chrome://extensions for anything unexpected.

## Fix

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

## Timeline

- 2026-11-03T21:19:22+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-121142

## From the sources

Incorrect authorization in Network in Google Chrome prior to 157.0.8103.38 allowed a remote attacker leveraging social engineering to bypass web origin policy via a crafted Chrome extension. (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_