Security Alert (A26-04-05): Multiple Vulnerabilities in FireFox


 

Published on: 08 April 2026

Description:

Mozilla has published the advisories (MFSA2026-25, MFSA2026-26 and MFSA2026-27) 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 115.34.1, 140.9.1
  • Firefox Windows versions prior to version 149.0.2

For detailed information of the affected systems, please refer to the corresponding security advisories at vendor's website.

 

Impact:

Successful exploitation of the vulnerabilities could lead to remote code execution or 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 149.0.2 (Windows)
https://www.mozilla.org/en-US/firefox/all/#product-desktop-release
Firefox ESR 115.34.1, 140.9.1 (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/mfsa2026-25/
  • https://www.mozilla.org/en-US/security/advisories/mfsa2026-26/
  • https://www.mozilla.org/en-US/security/advisories/mfsa2026-27/
  • https://www.hkcert.org/security-bulletin/mozilla-products-multiple-vulnerabilities_20260408
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-5731 (to CVE-2026-5735)


Tag: Firefox , Mozilla
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