Security Alert (A25-05-18): Multiple Vulnerabilities in Firefox

Description:

Mozilla has published the advisories (MFSA2025-42, MFSA2025-43, and MFSA2025-44) to address multiple vulnerabilities in Firefox browser. A remote attacker could entice a user running a vulnerable browser to visit a web page with specially crafted content to exploit the vulnerabilities.

Affected Systems:

• Firefox Windows versions prior to version 139
• Firefox ESR Windows versions prior to version 115.24, 128.11

Impact:

Successful exploitation of the vulnerabilities could lead to remote code execution, denial of service, information disclosure or security restriction bypass 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 139 (Windows)
https://www.mozilla.org/en-US/firefox/all/#product-desktop-release
Firefox ESR 115.24, 128.11 (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/mfsa2025-42/
• https://www.mozilla.org/en-US/security/advisories/mfsa2025-43/
• https://www.mozilla.org/en-US/security/advisories/mfsa2025-44/
• https://www.hkcert.org/security-bulletin/mozilla-products-multiple-vulnerabilities_20250528
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-5262 (to CVE-2025-5272)