CVE-2025-6426: Vulnerability in Mozilla Firefox
The executable file warning did not warn users before opening files with the `terminal` extension. *This bug only affects Firefox for macOS. Other versions of Firefox are unaffected.*. This vulnerability was fixed in Firefox 140, Firefox ESR 128.12, Thunderbird 140, and Thunderbird 128.12.
AI Analysis
Technical Summary
CVE-2025-6426 is a moderate-impact vulnerability in Firefox for macOS where the executable file warning mechanism failed to alert users before opening files with the terminal extension. This could allow unintended execution of terminal files without user awareness. The issue is specific to Firefox on macOS and does not affect other Firefox versions. Mozilla fixed this vulnerability in Firefox 140 and Firefox ESR 128.12. The CVSS base score is 8.8, reflecting high impact on confidentiality, integrity, and availability. The vendor advisory explicitly states the fix is included in these releases.
Potential Impact
The vulnerability could lead to users inadvertently executing terminal files without receiving a warning prompt, potentially resulting in execution of malicious code. The CVSS score of 8.8 indicates high impact on confidentiality, integrity, and availability. However, the issue is limited to Firefox on macOS and does not affect other platforms. No known exploits in the wild have been reported.
Mitigation Recommendations
Mozilla has released official fixes for this vulnerability in Firefox 140 and Firefox ESR 128.12. Users and administrators should update affected Firefox installations on macOS to these versions or later to remediate the issue. No additional mitigation steps are required once the update is applied.
CVE-2025-6426: Vulnerability in Mozilla Firefox
Description
The executable file warning did not warn users before opening files with the `terminal` extension. *This bug only affects Firefox for macOS. Other versions of Firefox are unaffected.*. This vulnerability was fixed in Firefox 140, Firefox ESR 128.12, Thunderbird 140, and Thunderbird 128.12.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2025-6426 is a moderate-impact vulnerability in Firefox for macOS where the executable file warning mechanism failed to alert users before opening files with the terminal extension. This could allow unintended execution of terminal files without user awareness. The issue is specific to Firefox on macOS and does not affect other Firefox versions. Mozilla fixed this vulnerability in Firefox 140 and Firefox ESR 128.12. The CVSS base score is 8.8, reflecting high impact on confidentiality, integrity, and availability. The vendor advisory explicitly states the fix is included in these releases.
Potential Impact
The vulnerability could lead to users inadvertently executing terminal files without receiving a warning prompt, potentially resulting in execution of malicious code. The CVSS score of 8.8 indicates high impact on confidentiality, integrity, and availability. However, the issue is limited to Firefox on macOS and does not affect other platforms. No known exploits in the wild have been reported.
Mitigation Recommendations
Mozilla has released official fixes for this vulnerability in Firefox 140 and Firefox ESR 128.12. Users and administrators should update affected Firefox installations on macOS to these versions or later to remediate the issue. No additional mitigation steps are required once the update is applied.
Technical Details
- Data Version
- 5.1
- Assigner Short Name
- mozilla
- Date Reserved
- 2025-06-20T14:51:29.856Z
- Cvss Version
- null
- State
- PUBLISHED
Threat ID: 685aa0274dc24046c1dc5a97
Added to database: 6/24/2025, 12:55:03 PM
Last enriched: 4/14/2026, 11:51:33 AM
Last updated: 5/9/2026, 5:34:48 AM
Views: 89
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