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Thunderbird CVE-2025-14327

HIGH
Authentication Bypass by Spoofing (CWE-290)
2025-12-09 security@mozilla.org
Mozilla Authentication Bypass Thunderbird Red Hat Suse
7.5
CVSS 3.1 · NVD
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Severity by source

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

Primary rating from NVD.

CVSS VectorNVD

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

Lifecycle Timeline

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

DescriptionCVE.org

Spoofing issue in the Downloads Panel component. This vulnerability was fixed in Firefox 146, Thunderbird 146, Firefox ESR 140.7, and Thunderbird 140.7.

AnalysisAI

Downloads Panel in Mozilla Firefox and Thunderbird allows remote spoofing attacks enabling integrity compromise without authentication. Affects Firefox <146, Thunderbird <146, Firefox ESR <140.7, and Thunderbird ESR <140.7. The authentication bypass flaw (CWE-290) permits network-based attackers to manipulate download information displayed to users with low attack complexity and no user interaction required. Despite CVSS 7.5 (High), EPSS score of 0.02% (3rd percentile) indicates minimal real-world exploitation likelihood. No active exploitation confirmed (not in CISA KEV), and no public exploit identified at time of analysis.

Technical ContextAI

The vulnerability targets the Downloads Panel component in Mozilla's Firefox browser and Thunderbird email client, specifically affecting the user interface elements that display download status and metadata. Classified as CWE-290 (Authentication Issues), this represents an authentication bypass weakness where the application fails to properly validate the authenticity or source integrity of download-related information. The CVSS vector indicates network-accessible exploitation (AV:N) without authentication requirements (PR:N), suggesting the Downloads Panel processes network-sourced data without sufficient verification of its origin or integrity. The affected products identified via CPE strings include all Mozilla Firefox and Thunderbird installations across platforms prior to the patched versions. The spoofing mechanism likely allows attackers to present falsified download sources, filenames, or security indicators that could deceive users into trusting malicious content.

RemediationAI

Vendor-released patches are available through standard Mozilla update channels. Upgrade Firefox to version 146 or later for standard release users, or Firefox ESR to version 140.7 or later for enterprise deployments requiring extended support cycles (advisory: https://www.mozilla.org/security/advisories/mfsa2025-92/). Thunderbird users should upgrade to version 146 or later (standard channel) or Thunderbird ESR 140.7 or later (ESR channel), as documented in advisory MFSA2025-95 (https://www.mozilla.org/security/advisories/mfsa2025-95/). Firefox and Thunderbird auto-update mechanisms will deliver patches automatically for users with updates enabled. Enterprise administrators managing large deployments should prioritize updates through existing software distribution frameworks. No workarounds are documented; patching is the only confirmed remediation. Users should verify post-update versions through Help > About menus in respective applications.

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Vendor StatusVendor

SUSE

Severity: High
Product Status
Container suse/sl-micro/6.0/baremetal-os-container:latest Container suse/sl-micro/6.0/kvm-os-container:latest Container suse/sl-micro/6.0/rt-os-container:latest Container suse/sl-micro/6.0/toolbox:latest Container suse/sl-micro/6.1/baremetal-os-container:2.2.1-7.2 Container suse/sl-micro/6.1/kvm-os-container:2.2.0-4.49 Container suse/sl-micro/6.1/rt-os-container:2.2.0-4.55 Affected
Container suse/sl-micro/6.0/base-os-container:latest Container suse/sl-micro/6.1/base-os-container:2.2.0-4.50 Image SL-Micro Image SL-Micro-Azure Image SL-Micro-BYOS-Azure Image SL-Micro-BYOS-EC2 Image SL-Micro-BYOS-GCE Image SL-Micro-Base Image SL-Micro-Base-RT Image SL-Micro-Base-RT-SelfInstall Image SL-Micro-Base-RT-encrypted Image SL-Micro-Base-SelfInstall Image SL-Micro-Base-encrypted Image SL-Micro-Base-qcow Image SL-Micro-Default Image SL-Micro-Default-SelfInstall Image SL-Micro-Default-encrypted Image SL-Micro-Default-qcow Image SL-Micro-EC2 Image SLE-Micro Image SLE-Micro-Azure Image SLE-Micro-BYOS Image SLE-Micro-BYOS-Azure Image SLE-Micro-BYOS-EC2 Image SLE-Micro-BYOS-GCE Image SLE-Micro-EC2 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
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CVE-2025-14327 vulnerability details – vuln.today
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