Check Point Advisories

Mozilla Multiple Products Information Disclosure (CVE-2026-6770)

Vulnerability
Protection

Check Point Reference:	CPAI-2026-3803
Date Published:	30 Apr 2026
Severity:	High
Last Updated:	Thursday 30 April, 2026
Source:
Industry Reference:	CVE-2026-6770
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	Mozilla Firefox ESR prior to 140.10.0 Mozilla Firefox prior to 150.0 Mozilla Thunderbird prior to 140.10.0
Vulnerability Description	An information disclosure vulnerability exists in multiple Mozilla products. Successful exploitation of this vulnerability would allow a remote attacker to obtain sensitive information.

Protection Overview

This protection detects attempts to exploit this vulnerability.

In order for the protection to be activated, update your Security Gateway product to the latest IPS update. For information on how to update IPS, go to SBP-2006-05, click on Protection tab and select the version of your choice.

Security Gateway R81 / R80 / R77 / R75

In the IPS tab, click Protections and find the Mozilla Multiple Products Information Disclosure (CVE-2026-6770) protection using the Search tool and Edit the protection's settings.
Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name: Web Client Enforcement Violation.
Attack Information: Mozilla Multiple Products Information Disclosure (CVE-2026-6770)