---
id: CVE-2026-118027
title: Frame poisoning in the Layout component
summary: >-
  Frame poisoning in the Layout component. This vulnerability was fixed in
  Firefox ESR 115.44.
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H'
cvssSource: adp
vendor: Mozilla
product: Firefox
affected:
  - Firefox
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-11-04T20:54:22.394431Z'
published: '2026-10-27'
updated: '2026-11-04'
sourceUpdated: '2026-11-04T20:55:12.108Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-118027'
references:
  - url: 'https://bugzilla.mozilla.org/show_bug.cgi?id=2045606'
  - url: 'https://www.mozilla.org/security/advisories/mfsa2026-119/'
tags:
  - cve.org
epss: 0.00133
epssPercentile: 0.02852
ingestedAt: '2026-10-27T16:11:59.436Z'
---

## Overview

Frame poisoning in the Layout component. This vulnerability was fixed in Firefox ESR 115.44.

## Affected

- `Firefox`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.