---
id: "CVE-2026-118337"
kind: "vulnerability"
aliases: ["CVE-2026-118337"]
title: "Google Chrome: Forms access control flaw lets a web page bypass origin policy"
severity: "high"
cvss: null
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["browsers", "chrome", "end-users", "endpoints", "runtime"]
not_affected_if: ["already-patched-chrome"]
published_at: "2026-10-27T23:17:02+00:00"
first_seen_at: "2026-10-27T23:29:43+00:00"
updated_at: "2026-10-27T23:31:46+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-118337", "first_seen_at": "2026-10-27T23:29:43+00:00"}]
---

# Google Chrome: Forms access control flaw lets a web page bypass origin policy

A flaw in the Forms component of Google Chrome before 156.0.8078.73 lets a remote attacker bypass the web origin policy using a crafted HTML page. The sources describe the bypass only in general terms, so the exact data an attacker can reach is unknown.

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

## How to check

- Run the Chrome version check (chrome://version) and compare the result with `156.0.8078.73`
- unknown

## Fix

- Update Google Chrome to `156.0.8078.73` or later
- unknown

## Timeline

- 2026-10-27T23:29:43+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-118337

## From the sources

Improper access control in Forms in Google Chrome prior to 156.0.8078.73 allowed a remote attacker to bypass web origin policy via a crafted HTML page. (Chromium security severity: High)

---

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