# CVE-2026-124934: Mozilla Firefox spoofing issue in Security component

Source: https://junglewise.ai/threats/cve-2026-124934-spoofing-issue-in-the-security-component-this-vulnerability-was  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-10. Updated: 2026-11-10  
License: CC BY 4.0 with a link back

CVE-2026-124934 · Severity: info · Published 2026-11-10

Firefox is a web browser used by millions of users to access websites and online services. A spoofing vulnerability in its security component could allow attackers to deceive users about the authenticity or safety of websites they visit, potentially leading to phishing or credential theft. This issue has been fixed in the latest versions of Firefox.

Technologies: [Mozilla Firefox](https://junglewise.ai/threats/technologies/firefox), [Mozilla Firefox ESR](https://junglewise.ai/threats/technologies/firefox-esr). Vendors: [Mozilla](https://junglewise.ai/threats/vendors/mozilla).

## Quick answers

**Is CVE-2026-124934 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-124934 being exploited in the wild.

**How severe is CVE-2026-124934?** Informational severity, published 10 November 2026.

**Which products and versions are affected?** Mozilla Firefox prior to 160; Mozilla Firefox ESR prior to 153.7.

**Is there a fix for CVE-2026-124934?** 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-2026-124934 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-124934?** 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

A spoofing vulnerability exists in Firefox's Security component that could allow misrepresentation of security-related information to users. The vulnerability affects Firefox versions prior to 160 and Firefox ESR versions prior to 153.7. Details are limited; however, the fix suggests a correctness issue in security UI or validation logic.

## Affected products

- Mozilla Firefox prior to 160
- Mozilla Firefox ESR prior to 153.7

## Timeline

- 2026-11-10: advisory
- 2026-11-10: patched

## References

- [https://bugzilla.mozilla.org/show_bug.cgi?id=1847625](https://bugzilla.mozilla.org/show_bug.cgi?id=1847625)
- [https://www.mozilla.org/security/advisories/mfsa2026-125/](https://www.mozilla.org/security/advisories/mfsa2026-125/)

## Related threats

- [Firefox ESR use-after-free in Audio/Video component](https://junglewise.ai/threats/cve-2026-124952-use-after-free-in-the-audio-video-component-this-vulnerability)
- [Firefox privilege escalation in Nimbus Desktop Client](https://junglewise.ai/threats/cve-2026-124951-privilege-escalation-in-the-nimbus-desktop-client-component-this)
- [Firefox same-origin policy bypass in CSS Parsing and Computation](https://junglewise.ai/threats/cve-2026-124950-same-origin-policy-bypass-in-the-css-parsing-and-computation)
- [Firefox other issue in SVG component](https://junglewise.ai/threats/cve-2026-124949-other-issue-in-the-svg-component-this-vulnerability-was-fixed-in)
- [Mozilla Firefox use-after-free in Graphics component](https://junglewise.ai/threats/cve-2026-124948-incorrect-boundary-conditions-use-after-free-in-the-graphics)