---
id: "CVE-2026-121029"
kind: "vulnerability"
aliases: ["CVE-2026-121029"]
title: "Chrome: crafted web page can bypass site isolation protections"
severity: "low"
cvss: null
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["browsers", "chrome", "linux", "macos", "runtime", "windows"]
not_affected_if: ["chrome-updated"]
published_at: "2026-11-03T21:17:05+00:00"
first_seen_at: "2026-11-03T21:19:08+00:00"
updated_at: "2026-11-03T21:27:37+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-121029", "first_seen_at": "2026-11-03T21:19:08+00:00"}]
---

# Chrome: crafted web page can bypass site isolation protections

Google Chrome's ORB (Opaque Response Blocking) component has an incorrect authorization check that lets a crafted HTML page bypass site isolation. An attacker who gets a victim to visit that page could read data from other sites the victim is logged into.

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

## How to check

- Check the installed Chrome version in Chrome's About page (chrome://settings/help) or with `google-chrome --version` on Linux.
- Flag any installation below `157.0.8103.38` as affected.

## Fix

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

## Timeline

- 2026-11-03T21:19:08+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-121029

## From the sources

Incorrect authorization in ORB in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to bypass site isolation 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_