---
id: "CVE-2026-124902"
page: "https://infrastack.ai/live/CVE-2026-124902"
kind: "vulnerability"
aliases: ["CVE-2026-124902"]
title: "Firefox: race condition in Audio/Video lets pages bypass same-origin policy"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "runtime"
products: [{"name": "Firefox", "fixed": [], "affected": "", "ecosystem": "runtime"}]
ecosystems: ["runtime"]
tags: ["browsers", "firefox", "runtime"]
not_affected_if: ["already-updated"]
published_at: "2026-11-10T14:17:23+00:00"
first_seen_at: "2026-11-10T14:22:16+00:00"
updated_at: "2026-11-10T14:24:49+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-124902", "first_seen_at": "2026-11-10T14:22:16+00:00"}]
exploit_sources: []
---

# Firefox: race condition in Audio/Video lets pages bypass same-origin policy

Link for people: https://infrastack.ai/live/CVE-2026-124902 (this .md is for agents)

A race condition in Firefox's Audio/Video component lets a page bypass the same-origin policy, which keeps websites from reading data from other sites. The fix is in Firefox 160, Firefox ESR 115.45 and Firefox ESR 153.7.

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

## Affected

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

## How to check

- Check the installed Firefox version in the About Firefox dialog or with `firefox --version`
- Exposed if the version is below `160` on the current branch, below `115.45` on ESR 115, or below `153.7` on ESR 153

## Fix

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

## Timeline

- 2026-11-10T14:22:16+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-124902

## From the sources

Same-origin policy bypass due to race condition in the Audio/Video 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_