Quick answers
- Is CVE-2026-124914 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-124914 being exploited in the wild.
- How severe is CVE-2026-124914?
- Informational severity, published 10 November 2026.
- Which products and versions are affected?
- Mozilla Firefox before 160; Mozilla Firefox ESR before 153.7.
- Is there a fix for CVE-2026-124914?
- Yes: fixed in Firefox 160, Firefox ESR 153.7. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-124914 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-124914?
- Check whether you run Mozilla Firefox or Mozilla Firefox ESR at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: Firefox 160, Firefox ESR 153.7
Technical details
This is a site isolation bypass in the DOM Navigation component. The vulnerability allows attackers to circumvent browser sandbox protections that keep separate web pages isolated from each other. The attack requires network access and a user visiting a malicious website, but does not require authentication or user interaction beyond navigation.
Affected products
- Mozilla Firefox before 160
- Mozilla Firefox ESR before 153.7
Timeline
- 2026-11-10: disclosed: CVE-2026-124914 published