---
id: "CVE-2026-121251"
kind: "vulnerability"
aliases: ["CVE-2026-121251"]
title: "Chrome: V8 authorization gap lets a crafted page bypass web origin policy"
severity: "low"
cvss: null
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["browser", "chrome", "runtime", "web-users"]
not_affected_if: ["chrome-up-to-date"]
published_at: "2026-11-03T21:17:35+00:00"
first_seen_at: "2026-11-03T21:19:29+00:00"
updated_at: "2026-11-03T21:20:58+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-121251", "first_seen_at": "2026-11-03T21:19:29+00:00"}]
---

# Chrome: V8 authorization gap lets a crafted page bypass web origin policy

A missing authorization check in the V8 JavaScript engine in Google Chrome versions before 157.0.8103.38 lets a remote attacker bypass web origin policy using a crafted HTML page. Chromium rates it Low severity, and the source does not say what data an attacker could read or change.

_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`.

## Fix

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

## Timeline

- 2026-11-03T21:19:29+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-121251

## From the sources

Missing authorization in V8 in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to bypass web origin policy via a crafted HTML page. (Chromium security severity: Low)

---

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