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Thunderbird CVE-2025-8038

CRITICAL
Insufficient Verification of Data Authenticity (CWE-345)
2025-07-22 security@mozilla.org
Mozilla Information Disclosure Thunderbird Red Hat Suse
Critical
Disputed · 9.8 NVD
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Severity by source

Sources disagree (Low–Critical)
NVD PRIMARY
9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SUSE
CRITICAL
qualitative
Red Hat
3.4 LOW
qualitative

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorNVD

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

Lifecycle Timeline

1
Analysis Generated
Apr 13, 2026 - 15:41 vuln.today

DescriptionCVE.org

Thunderbird ignored paths when checking the validity of navigations in a frame. This vulnerability was fixed in Firefox 141, Firefox ESR 140.1, Thunderbird 141, and Thunderbird 140.1.

AnalysisAI

Frame navigation validation bypass in Mozilla Firefox and Thunderbird allows unauthenticated remote attackers to violate security boundaries due to improper path checking (CWE-345). Affects Firefox <141, Firefox ESR <140.1, Thunderbird <141, and Thunderbird ESR <140.1. The CVSS 9.8 critical score reflects network-based exploitation with no user interaction required, enabling potential unauthorized access, data manipulation, and service disruption. No public exploit identified at time of analysis, though the network attack vector (AV:N) and low complexity (AC:L) suggest straightforward exploitation once technical details emerge.

Technical ContextAI

This vulnerability stems from CWE-345 (Insufficient Verification of Data Authenticity), specifically in Mozilla's frame navigation validation logic. Frames in web browsers enforce same-origin policy to prevent malicious sites from manipulating content across security boundaries. By ignoring path components during navigation validity checks, Firefox and Thunderbird failed to properly validate whether navigation requests should be permitted between frames with different paths under the same origin. This affects the browser's fundamental security model for isolating web content. The flaw impacts both the standard Firefox browser (cpe:2.3:a:mozilla:firefox) and extended support releases (ESR), as well as the Thunderbird email client which shares Mozilla's rendering engine. Path-based security checks are critical in web platform security, as they prevent attackers from bypassing origin restrictions through crafted navigation sequences.

RemediationAI

Vendor-released patches are available. Immediately upgrade Firefox standard release to version 141 or later, Firefox ESR to version 140.1 or later, Thunderbird standard release to version 141 or later, and Thunderbird ESR to version 140.1 or later. Mozilla auto-update mechanisms will deploy these fixes automatically for most users within 24-48 hours. Enterprise deployments using managed updates should prioritize rapid deployment given the critical CVSS score and network-based attack vector. Verify successful patching by navigating to About Firefox or About Thunderbird in the application menu. No effective workarounds exist short of disabling frame support entirely, which would break legitimate web functionality. Complete advisory details available at https://www.mozilla.org/security/advisories/mfsa2025-56/ (Firefox), https://www.mozilla.org/security/advisories/mfsa2025-59/ (Firefox ESR), https://www.mozilla.org/security/advisories/mfsa2025-61/ (Thunderbird), and https://www.mozilla.org/security/advisories/mfsa2025-63/ (Thunderbird ESR).

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Vendor StatusVendor

SUSE

Severity: Critical
Product Status
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 Affected
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 Affected
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-2025-8038 vulnerability details – vuln.today
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