Security Alert (A26-10-35): Multiple Vulnerabilities in FireFox


 

Published on: 21 October 2026

Description:

Mozilla has published the advisories (MFSA2026-111, MFSA2026-112 and MFSA2026-113) to address multiple vulnerabilities in Firefox. A remote attacker could entice a user to open a web page with specially crafted content on a vulnerable browser to exploit the vulnerabilities.

 

Affected Systems:

  • Firefox ESR Windows versions prior to version 115.43.1, 153.5.1
  • Firefox Windows versions prior to version 158.0.1

 

Impact:

Successful exploitation of the vulnerabilities could lead to denial of service on an affected system.

 

Recommendation:

Mozilla has released new versions of the product to address the issues and they can be downloaded at the following URLs:
Firefox 158.0.1 (Windows)
https://www.mozilla.org/en-US/firefox/all/#product-desktop-release
Firefox ESR 115.43.1, 153.5.1 (Windows)
https://www.mozilla.org/en-US/firefox/all/#product-desktop-esr

Users of affected systems should follow the recommendations provided by the vendor and take immediate actions to mitigate the risk.

 

More Information:

  • https://www.mozilla.org/en-US/security/advisories/mfsa2026-111/
  • https://www.mozilla.org/en-US/security/advisories/mfsa2026-112/
  • https://www.mozilla.org/en-US/security/advisories/mfsa2026-113/
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-113399 (to CVE-2026-113401)
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-113470


Tag: Firefox , Mozilla
Tags