Security Alert (A26-09-29): Multiple Vulnerabilities in FireFox


 

Published on: 16 September 2026

Description:

Mozilla has published the advisories (MFSA2026-90, MFSA2026-91, MFSA2026-92 and MFSA2026-93) 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 115.41, 140.16, 153.3
  • Firefox Windows versions prior to version 156

 

Impact:

Successful exploitation of the vulnerabilities could lead to denial of service, elevation of privilege, information disclosure, security restriction bypass or spoofing 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 156 (Windows)
https://www.mozilla.org/en-US/firefox/all/#product-desktop-release
Firefox ESR 115.41, 140.16, 153.3 (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/mfsa2026-90/
  • https://www.mozilla.org/en-US/security/advisories/mfsa2026-91/
  • https://www.mozilla.org/en-US/security/advisories/mfsa2026-92/
  • https://www.mozilla.org/en-US/security/advisories/mfsa2026-93/
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-92005 (to CVE-2026-92079)


Tag: Firefox , Mozilla
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