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9.8CRITICAL

Multiple Vulnerabilities in Mozilla Products Could Allow for Arbitrary Code Execution

📅 20 May 2026 at 00:37 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.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, with the most severe vulnerability having a CVSS score of 9.8 and affecting Firefox versions prior to 151, Firefox for iOS prior to 151.0, and Firefox ESR versions prior to 140.11.

⚙️Technical Details
Affected Systems
FirefoxFirefox for iOSFirefox ESR
Attack Vectors
NETWORK
💥Impact Assessment
Severity: Unknown
🛡️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-2026-8946CVSS 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
Affected Products (CPE)
Mozilla FirefoxMozilla Thunderbird
CVE-2026-8388CVSS 6.5MEDIUM
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:N
Weaknesses
CWE-119
Affected Products (CPE)
Mozilla Firefox
CVE-2026-8947CVSS 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-416
Affected Products (CPE)
Mozilla FirefoxMozilla Thunderbird
CVE-2026-8391CVSS 5.3MEDIUM
Attack Vector
NETWORK
Complexity
LOW
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weaknesses
CWE-119CWE-79CWE-20
Affected Products (CPE)
Mozilla Firefox
CVE-2026-8401CVSS 9.8CRITICAL
Attack Vector
NETWORK
Complexity
LOW
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weaknesses
CWE-693
Affected Products (CPE)
Mozilla Firefox

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