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9.6CRITICAL

Multiple Vulnerabilities in Mozilla Products Could Allow for Arbitrary Code Execution

📅 28 April 2026 at 17:52 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.Mozilla Thunderbird is an email client.Mozilla Thunderbird ESR is a version of the email client intended to be deployed in large organizations.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 were discovered in Mozilla products, allowing for arbitrary code execution if exploited successfully, primarily affecting government and business entities with high privileges.

⚙️Technical Details
CVEs
CVE-2026-7320CVE-2026-7322CVE-2026-7323CVE-2026-7324CVE-2026-7321
Affected Systems
Firefox versions prior to 150.0.1Firefox ESR versions prior to 140.10.1Thunderbird versions prior to 150.0.1Thunderbird ESR versions prior to 140.10.1
Attack Vectors
NETWORK
💥Impact Assessment
Severity: HIGH
🛡️Recommended Actions
1Apply appropriate updates provided by Mozilla to vulnerable systems immediately after testing.
2Establish and maintain a documented vulnerability management process for enterprise assets.
3Enable anti-exploitation features on enterprise assets and software, where possible.
📦Affected Products
FirefoxThunderbird
🔐NVD Verified DataVERIFIED
CVE-2026-7320CVSS 7.5HIGH
Attack Vector
NETWORK
Complexity
LOW
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weaknesses
CWE-119
CVE-2026-7322CVSS 7.3HIGH
Attack Vector
NETWORK
Complexity
LOW
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Weaknesses
CWE-416CWE-119
CVE-2026-7323CVSS 7.3HIGH
Attack Vector
NETWORK
Complexity
LOW
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Weaknesses
CWE-787CWE-119
CVE-2026-7324CVSS 7.3HIGH
Attack Vector
NETWORK
Complexity
LOW
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Weaknesses
CWE-119
CVE-2026-7321CVSS 9.6CRITICAL
Attack Vector
NETWORK
Complexity
LOW
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Weaknesses
CWE-120

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