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8.8CRITICAL

Multiple Vulnerabilities in Mozilla Products Could Allow for Arbitrary Code Execution

📅 16 June 2026 at 19:30 UTC📰 CIS AdvisoriesView original source ↗

Multiple vulnerabilities have been discovered in Mozilla products, the most severe of which could allow for arbitrary code execution. Mozilla Firefox is a web browser used to access the Internet.Mozilla Firefox ESR is a version of the web browser intended to be deployed in large organizations.Thunderbird is a free, open-source email, calendar, and chat application.Successful exploitation of the most severe of these vulnerabilities could allow for arbitrary code execution. Depending on the privileges associated with the user an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than those who operate with administrative user rights.

🤖 AI BriefingAuto-generated threat analysis
🔍Threat Overview

Multiple vulnerabilities have been discovered in Mozilla products, allowing for arbitrary code execution if exploited successfully, primarily affecting users with administrative privileges.

⚙️Technical Details
CVEs
CVE-2026-12289CVE-2026-12290CVE-2026-12291CVE-2026-12292CVE-2026-12293CVE-2026-12294CVE-2026-12295CVE-2026-12296CVE-2026-12297CVE-2026-12298CVE-2026-12300CVE-2026-12301CVE-2026-12302CVE-2026-12303CVE-2026-12304CVE-2026-12305CVE-2026-12306CVE-2026-12307CVE-2026-12308CVE-2026-12309CVE-2026-12310CVE-2026-12311CVE-2026-12312CVE-2026-12313CVE-2026-12314CVE-2026-12315CVE-2026-12316CVE-2026-12317CVE-2026-12318CVE-2026-12319CVE-2026-12320CVE-2026-12321CVE-2026-12322CVE-2026-12323CVE-2026-12324
Affected Systems
Mozilla Firefox versions prior to 152Firefox ESR versions prior to 140.12Thunderbird versions prior to 152Thunderbird ESR versions prior to 140.12
Attack Vectors
NETWORK
💥Impact Assessment
Severity: HIGH
🛡️Recommended Actions
1Apply appropriate updates provided by Mozilla to vulnerable systems immediately after appropriate testing.
2Establish and maintain a documented vulnerability management process for enterprise assets.
3Perform application updates on enterprise assets through automated patch management on a monthly, or more frequent, basis.
📦Affected Products
Mozilla FirefoxMozilla Thunderbird
🔐NVD Verified DataVERIFIED
CVE-2026-12289CVSS 8.8HIGH
Attack Vector
NETWORK
Complexity
LOW
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weaknesses
CWE-269
Affected Products (CPE)
Mozilla FirefoxMozilla Thunderbird

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