---
id: "CVE-2026-121124"
kind: "vulnerability"
aliases: ["CVE-2026-121124"]
title: "Google Chrome: XML coding flaw lets a crafted web page run code in sandbox"
severity: "high"
cvss: null
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["browsers", "chrome", "desktop", "runtime"]
not_affected_if: ["already-updated", "no-chrome"]
published_at: "2026-11-03T21:17:20+00:00"
first_seen_at: "2026-11-03T21:19:19+00:00"
updated_at: "2026-11-03T21:24:56+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-121124", "first_seen_at": "2026-11-03T21:19:19+00:00"}]
---

# Google Chrome: XML coding flaw lets a crafted web page run code in sandbox

Google Chrome versions before 157.0.8103.38 mishandle XML, so a remote attacker can craft an HTML page that may execute arbitrary code inside the browser sandbox. Chromium rates the flaw High severity.

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

## How to check

- Open Chrome, go to Settings > About Chrome and read the version number.
- Check whether the installed version is below `157.0.8103.38`.

## Fix

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

## Timeline

- 2026-11-03T21:19:19+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-121124

## From the sources

Improper adherence to coding standards in XML in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to potentially execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: High)

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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_