---
id: "CVE-2026-124910"
page: "https://infrastack.ai/live/CVE-2026-124910"
kind: "vulnerability"
aliases: ["CVE-2026-124910"]
title: "Firefox: WebExtensions mitigation bypass fixed in Firefox 160"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["browser-extensions", "firefox", "runtime"]
not_affected_if: []
published_at: "2026-11-10T14:17:24+00:00"
first_seen_at: "2026-11-10T14:22:17+00:00"
updated_at: "2026-11-10T14:24:41+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-124910", "first_seen_at": "2026-11-10T14:22:17+00:00"}]
exploit_sources: []
---

# Firefox: WebExtensions mitigation bypass fixed in Firefox 160

Link for people: https://infrastack.ai/live/CVE-2026-124910 (this .md is for agents)

A mitigation bypass in Firefox's WebExtensions component weakens a protection meant to stop extension-based attacks. The sources do not say what an attacker can do beyond bypassing that mitigation.

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

## How to check

- Check the Firefox version with Help > About Firefox; versions below `160` (or ESR below `153.7`) are listed as affected in the sources.

## Fix

- Firefox `160`
- Firefox ESR `153.7`

## Timeline

- 2026-11-10T14:22:17+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-124910

## From the sources

Mitigation bypass in the WebExtensions 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_