---
id: CVE-2025-12909
title: >-
  Insufficient policy enforcement in Devtools in Google Chrome prior to
  140.0.7339.80 allowed a remote attacker to leak cross-origin data via Devtools
summary: >-
  Insufficient policy enforcement in Devtools in Google Chrome prior to
  140.0.7339.80 allowed a remote attacker to leak cross-origin data via
  Devtools. (Chromium security severity: Low)
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'
cwe:
  - CWE-693
vendor: google
product: chrome
affected:
  - chrome < 140.0.7339.80
patched:
  - chrome 140.0.7339.80
published: '2025-11-08'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T16:10:00.223'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-12909'
references:
  - url: >-
      https://chromereleases.googleblog.com/2025/09/stable-channel-update-for-desktop.html
    label: chrome-cve-admin@google.com
  - url: 'https://issues.chromium.org/issues/361116749'
    label: chrome-cve-admin@google.com
tags:
  - nvd
epss: 0.00195
epssPercentile: 0.08286
ingestedAt: '2026-09-30T17:13:20.722Z'
---

## Overview

Insufficient policy enforcement in Devtools in Google Chrome prior to 140.0.7339.80 allowed a remote attacker to leak cross-origin data via Devtools. (Chromium security severity: Low)

## Affected

- `chrome < 140.0.7339.80`

## Remediation

Upgrade past the affected range:

- `chrome 140.0.7339.80`