---
id: "CVE-2026-124853"
page: "https://infrastack.ai/live/CVE-2026-124853"
kind: "vulnerability"
aliases: ["CVE-2026-124853"]
title: "Firefox: boundary error in Graphics Text lets content escape sandbox"
severity: "high"
cvss: null
epss: null
exploited: false
status: "open"
category: "other"
products: []
ecosystems: []
tags: ["browser", "desktop", "firefox", "other"]
not_affected_if: ["already-updated"]
published_at: "2026-11-10T14:17:17+00:00"
first_seen_at: "2026-11-10T14:22:13+00:00"
updated_at: "2026-11-10T14:26:44+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-124853", "first_seen_at": "2026-11-10T14:22:13+00:00"}]
exploit_sources: []
---

# Firefox: boundary error in Graphics Text lets content escape sandbox

Link for people: https://infrastack.ai/live/CVE-2026-124853 (this .md is for agents)

A flaw in Firefox's Graphics: Text component lets content break out of the browser's sandbox. The sources do not say what an attacker gets beyond that escape.

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

## How to check

- Check the installed Firefox version in the browser's About page or with `firefox --version`
- Compare against fixed versions `160`, `115.45` (ESR) and `153.7` (ESR)

## Fix

- Firefox: `160`
- Firefox ESR: `115.45` and `153.7`

## Timeline

- 2026-11-10T14:22:13+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-124853

## From the sources

Sandbox escape due to incorrect boundary conditions in the Graphics: Text component. This vulnerability was fixed in Firefox 160, Firefox ESR 115.45, 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_