---
id: "CVE-2026-124913"
page: "https://infrastack.ai/live/CVE-2026-124913"
kind: "vulnerability"
aliases: ["CVE-2026-124913"]
title: "Firefox: site isolation flaw in Networking component fixed in 160"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "other"
products: [{"name": "Firefox", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["browser", "desktop", "firefox", "other"]
not_affected_if: ["firefox-160-or-later", "firefox-esr-153.7-or-later"]
published_at: "2026-11-10T14:17:25+00:00"
first_seen_at: "2026-11-10T14:22:17+00:00"
updated_at: "2026-11-10T14:24:37+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-124913", "first_seen_at": "2026-11-10T14:22:17+00:00"}]
exploit_sources: []
---

# Firefox: site isolation flaw in Networking component fixed in 160

Link for people: https://infrastack.ai/live/CVE-2026-124913 (this .md is for agents)

A site isolation issue in the Networking component of Firefox lets a malicious website reach data it should not see across site boundaries. The sources do not say what data an attacker can read or how easily it is triggered.

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

## Affected

- vendor:Firefox affected range not listed fixed no fixed version listed

## How to check

- Check the Firefox version with `about:support` in the address bar; versions below `160` on Firefox or `153.7` on Firefox ESR are affected.
- Check whether ESR is in use via `about:support` (Application Basics shows the update channel).

## Fix

- Firefox: `160`
- Firefox ESR: `153.7`

## Timeline

- 2026-11-10T14:22:17+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-124913

## From the sources

Site isolation issue in the Networking component. This vulnerability was fixed in Firefox 160 and Firefox ESR 153.7.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_