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Thunderbird CVE-2025-8039

HIGH
Information Exposure (CWE-200)
2025-07-22 security@mozilla.org
Mozilla Information Disclosure Thunderbird Red Hat Suse
High
Disputed · 8.1 NVD
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Severity by source

Sources disagree (Low–High)
NVD PRIMARY
8.1 HIGH
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
SUSE
HIGH
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:R/S:U/C:H/I:H/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

Lifecycle Timeline

1
Analysis Generated
Apr 13, 2026 - 15:42 vuln.today

DescriptionCVE.org

In some cases search terms persisted in the URL bar even after navigating away from the search page. This vulnerability was fixed in Firefox 141, Firefox ESR 140.1, Thunderbird 141, and Thunderbird 140.1.

AnalysisAI

Search term leakage in Mozilla Firefox and Thunderbird URL bars exposes sensitive user queries to unauthorized parties when URLs are shared or logged. Firefox versions prior to 141 (regular) and 140.1 (ESR), and Thunderbird versions prior to 141 (regular) and 140.1 (ESR) fail to properly clear search parameters from the URL bar after navigation, enabling information disclosure through shoulder surfing, screenshot sharing, browser history exports, or URL-based tracking. No public exploit identified at time of analysis, though the attack requires only user interaction (EPSS data not provided). CVSS 8.1 reflects high confidentiality and integrity impact despite requiring user interaction.

Technical ContextAI

This vulnerability stems from improper output neutralization for logs (CWE-200: Exposure of Sensitive Information to an Unauthorized Actor) in Mozilla's URL bar implementation. Modern browsers typically sanitize or clear sensitive URL parameters after navigation to prevent inadvertent disclosure, but affected Firefox and Thunderbird versions failed to implement this protection for search queries. The URL bar is a critical UI component that displays and stores navigation history, making it a potential vector for information leakage when users share screenshots, copy URLs for collaboration, or when browser sync/logging mechanisms capture URL history. The affected products span both Firefox (standalone browser) and Thunderbird (email client with integrated web browsing), across both regular release channels and Extended Support Release (ESR) branches designed for enterprise deployments.

RemediationAI

Upgrade Firefox to version 141 or later for standard release channel users, or to version 140.1 or later for Extended Support Release (ESR) deployments. Thunderbird users should upgrade to version 141 (standard) or 140.1 (ESR) respectively. Patches are available through Mozilla's standard update mechanisms including automatic updates, manual downloads from mozilla.org, and enterprise deployment tools like Firefox ESR distribution packages. Consult the official Mozilla security advisories 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) for product-specific update instructions. No workarounds are documented; patching is the only definitive mitigation. Enterprise administrators should prioritize ESR updates for managed deployments and verify update completion through endpoint management systems.

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Same weakness CWE-200 – Information Exposure

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Same technique Information Disclosure

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Vendor StatusVendor

SUSE

Severity: High
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-2025-8039 vulnerability details – vuln.today
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