---
id: "CVE-2026-121255"
kind: "vulnerability"
aliases: ["CVE-2026-121255"]
title: "Chrome: Autofill AI flaw lets a crafted web page read cross-origin data"
severity: "medium"
cvss: null
epss: null
exploited: false
status: "open"
category: "other"
products: []
ecosystems: []
tags: ["browser", "chrome", "end-users", "other"]
not_affected_if: ["chrome-updated"]
published_at: "2026-11-03T21:17:36+00:00"
first_seen_at: "2026-11-03T21:19:29+00:00"
updated_at: "2026-11-03T21:20:54+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-121255", "first_seen_at": "2026-11-03T21:19:29+00:00"}]
---

# Chrome: Autofill AI flaw lets a crafted web page read cross-origin data

Google Chrome's Autofill AI feature had an incorrect authorization check before version 157.0.8103.38. A remote attacker who lures a user to a crafted HTML page can obtain data from other origins.

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

## How to check

- Check the Chrome version under Chrome menu > Help > About Google Chrome, or run `chrome://version` in the address bar.
- Confirm whether Autofill AI is enabled in Chrome settings (unknown whether it is on by default).

## 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-2026-121255

## From the sources

Incorrect authorization in Autofill AI 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: Medium)

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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_