---
id: "CVE-2026-121138"
kind: "vulnerability"
aliases: ["CVE-2026-121138"]
title: "Chrome: CORS discrepancy lets a crafted web page read cross-origin data"
severity: "low"
cvss: null
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["browsers", "chrome", "end-users", "runtime"]
not_affected_if: ["chrome-updated", "non-chromium-browser"]
published_at: "2026-11-03T21:17:22+00:00"
first_seen_at: "2026-11-03T21:19:22+00:00"
updated_at: "2026-11-03T21:24:40+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-121138", "first_seen_at": "2026-11-03T21:19:22+00:00"}]
---

# Chrome: CORS discrepancy lets a crafted web page read cross-origin data

Google Chrome before 157.0.8103.38 has an observable discrepancy in its CORS handling. A remote attacker who gets a victim to open a crafted HTML page can obtain cross-origin data.

_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 note the version
- Check that the version is `157.0.8103.38` or later

## Fix

- Google Chrome: `157.0.8103.38`

## Timeline

- 2026-11-03T21:19:22+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-121138

## From the sources

Observable discrepancy in CORS in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to obtain cross-origin data 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_