Security Alert (A26-02-30): Multiple Vulnerabilities in Firefox


 

Published on: 25 February 2026

Description:

Mozilla has published the advisories (MFSA2026-13, MFSA2026-14 and MFSA2026-15) 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 115.33, 140.8
  • Firefox Windows versions prior to version 148

 

Impact:

Successful exploitation of the vulnerabilities could lead to remote code execution, 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 148 (Windows)
https://www.mozilla.org/en-US/firefox/all/#product-desktop-release
Firefox ESR 115.33, 140.8 (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/mfsa2026-13/
  • https://www.mozilla.org/en-US/security/advisories/mfsa2026-14/
  • https://www.mozilla.org/en-US/security/advisories/mfsa2026-15/
  • https://www.hkcert.org/security-bulletin/mozilla-products-multiple-vulnerabilities_20260225
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-2757 (to CVE-2026-2807)


Tag: Firefox , Mozilla
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