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Thunderbird CVE-2025-14328

HIGH
2025-12-09 security@mozilla.org
Mozilla Privilege Escalation Thunderbird Red Hat Suse
8.8
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
8.8 HIGH
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
SUSE
HIGH
qualitative
Red Hat
6.1 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

1
Analysis Generated
Apr 13, 2026 - 16:11 vuln.today

DescriptionCVE.org

Privilege escalation in the Netmonitor component. This vulnerability was fixed in Firefox 146, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.

AnalysisAI

Privilege escalation in Mozilla Firefox and Thunderbird's Netmonitor component allows unauthenticated remote attackers to gain elevated privileges via user interaction. Affects Firefox <146, Firefox ESR <140.6, Thunderbird <146, and Thunderbird ESR <140.6. With an 8.8 CVSS score but only 0.07% EPSS (22nd percentile), no public exploit identified at time of analysis, and vendor-released patches available. Not listed in CISA KEV, indicating no confirmed active exploitation.

Technical ContextAI

The Netmonitor component is a developer tool built into Firefox and Thunderbird browsers that allows inspection of network requests and responses. This privilege escalation flaw affects both the standard release and Extended Support Release (ESR) branches of Firefox (versions prior to 146 and 140.6 respectively) and Thunderbird (versions prior to 146 and 140.6 respectively). While specific CWE classification is not available, privilege escalation vulnerabilities in browser components typically involve improper handling of content security policies, insufficient permission checks in privileged contexts, or failure to properly isolate developer tool functionality from web content. The Netmonitor component operates with elevated browser privileges to inspect network traffic, making it a high-value target if content from untrusted origins can interact with or manipulate this interface inappropriately.

RemediationAI

Vendor-released patches are available: upgrade Firefox standard release to version 146 or later, Firefox ESR to version 140.6 or later, Thunderbird standard release to version 146 or later, and Thunderbird ESR to version 140.6 or later. Organizations should deploy updates through existing browser management solutions or enable automatic updates in Firefox/Thunderbird preferences. For environments unable to immediately patch, consider disabling developer tools including Netmonitor for non-developer users via enterprise policies (policies.json or Group Policy) to reduce attack surface, though this is a mitigation rather than complete fix. Full remediation details available in Mozilla Security Advisories at https://www.mozilla.org/security/advisories/mfsa2025-92/, https://www.mozilla.org/security/advisories/mfsa2025-94/, https://www.mozilla.org/security/advisories/mfsa2025-95/, and https://www.mozilla.org/security/advisories/mfsa2025-96/. No workaround fully eliminates risk; patching is the recommended solution.

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Vendor StatusVendor

SUSE

Severity: High
Product Status
Container suse/sl-micro/6.0/toolbox:latest Affected
Container suse/sl-micro/6.1/baremetal-os-container:2.2.1-7.2 Image SL-Micro-Azure Image SL-Micro-BYOS-Azure Image SL-Micro-BYOS-EC2 Image SL-Micro-BYOS-GCE Image SL-Micro-EC2 Image SLE-Micro-BYOS-GCE Image SLE-Micro-GCE Image SUSE-Multi-Linux-Manager-Proxy-BYOS-Azure Image SUSE-Multi-Linux-Manager-Proxy-BYOS-EC2 Image SUSE-Multi-Linux-Manager-Proxy-BYOS-GCE Image SUSE-Multi-Linux-Manager-Server-Azure-llc Image SUSE-Multi-Linux-Manager-Server-Azure-ltd Image SUSE-Multi-Linux-Manager-Server-BYOS-Azure Image SUSE-Multi-Linux-Manager-Server-BYOS-EC2 Image SUSE-Multi-Linux-Manager-Server-BYOS-GCE Image SUSE-Multi-Linux-Manager-Server-EC2-llc Image SUSE-Multi-Linux-Manager-Server-EC2-ltd Affected
Image SLES12-SP5-SAP-Azure-LI-BYOS-Production Image SLES12-SP5-SAP-Azure-VLI-BYOS-Production Affected
Image SLES15-SP4-SAP-Azure-LI-BYOS Image SLES15-SP4-SAP-Azure-LI-BYOS-Production Image SLES15-SP4-SAP-Azure-VLI-BYOS Image SLES15-SP4-SAP-Azure-VLI-BYOS-Production Image SLES15-SP5-SAP-Azure-LI-BYOS Image SLES15-SP5-SAP-Azure-LI-BYOS-Production Image SLES15-SP5-SAP-Azure-VLI-BYOS Image SLES15-SP5-SAP-Azure-VLI-BYOS-Production Image SLES15-SP6-SAP-Azure-LI-BYOS Image SLES15-SP6-SAP-Azure-LI-BYOS-Production Image SLES15-SP6-SAP-Azure-VLI-BYOS Image SLES15-SP6-SAP-Azure-VLI-BYOS-Production Image SLES15-SP7-SAP-Azure-LI-BYOS-Production Image SLES15-SP7-SAP-Azure-VLI-BYOS-Production Affected
SUSE Enterprise Storage 7.1 Fixed

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CVE-2025-14328 vulnerability details – vuln.today
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