---
id: "CVE-2026-124859"
page: "https://infrastack.ai/live/CVE-2026-124859"
kind: "vulnerability"
aliases: ["CVE-2026-124859"]
title: "Firefox: Storage Cache API flaw lets web content escape sandbox"
severity: "high"
cvss: null
epss: null
exploited: false
status: "open"
category: "other"
products: [{"name": "Firefox", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["browser", "firefox", "linux", "macos", "other", "windows"]
not_affected_if: ["fixed-version"]
published_at: "2026-11-10T14:17:18+00:00"
first_seen_at: "2026-11-10T14:22:13+00:00"
updated_at: "2026-11-10T14:26:38+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-124859", "first_seen_at": "2026-11-10T14:22:13+00:00"}]
exploit_sources: []
---

# Firefox: Storage Cache API flaw lets web content escape sandbox

Link for people: https://infrastack.ai/live/CVE-2026-124859 (this .md is for agents)

A boundary-check error in the Storage Cache API of Firefox allows a sandbox escape. An attacker who gets content running in the browser may be able to break out of the sandbox that normally contains it.

_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 in Help > About Firefox, or run `firefox --version` on the machine
- Compare against fixed versions `160`, `115.45` (ESR) and `153.7` (ESR)

## Fix

- Firefox `160`
- Firefox ESR `115.45`
- Firefox ESR `153.7`

## Timeline

- 2026-11-10T14:22:13+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-124859

## From the sources

Sandbox escape due to incorrect boundary conditions in the Storage: Cache API component. This vulnerability was fixed in Firefox 160, Firefox ESR 115.45, and Firefox ESR 153.7.

---

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