Security Alert (A26-05-35): Multiple Vulnerabilities in Firefox

Description:

Mozilla has published the advisories (MFSA2026-46, MFSA2026-47 and MFSA2026-48) 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 115.36, 140.11
• Firefox Windows versions prior to version 151

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 151 (Windows)
https://www.mozilla.org/en-US/firefox/all/#product-desktop-release
Firefox ESR 115.36, 140.11 (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/mfsa2026-46/
• https://www.mozilla.org/en-US/security/advisories/mfsa2026-47/
• https://www.mozilla.org/en-US/security/advisories/mfsa2026-48/
• https://www.hkcert.org/security-bulletin/mozilla-products-multiple-vulnerabilities_20260520
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-8388
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-8391
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-8401
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-8945 (to CVE-2026-8975)