CVE-2026-92030: Vulnerability in Mozilla Firefox
Mitigation bypass in the DOM: Copy & Paste and Drag & Drop component. This vulnerability was fixed in Firefox 156, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 140.16.
AI Analysis
Technical Summary
CVE-2026-92030 is a vulnerability in Mozilla Firefox's DOM Copy & Paste and Drag & Drop component that allows mitigation bypass. This flaw was fixed in Firefox 156, Firefox ESR 140.16, and Firefox ESR 153.3. The Mozilla advisories confirm the fix and classify the impact as moderate. The vulnerability was publicly disclosed on September 15, 2026, and no known exploits in the wild have been reported. The vendor advisory explicitly states the fixed versions and provides detailed references to the bug report.
Potential Impact
The vulnerability allows bypassing security mitigations in the DOM related to Copy & Paste and Drag & Drop operations, which could potentially be leveraged to circumvent security controls within the browser environment. The impact is rated moderate by Mozilla, indicating a significant but not critical risk. No active exploitation has been reported.
Mitigation Recommendations
Mozilla has released official fixes for this vulnerability in Firefox 156, Firefox ESR 140.16, and Firefox ESR 153.3. Users and administrators should update to these versions or later to remediate the issue. Since official patches are available, applying these updates is the recommended mitigation.
CVE-2026-92030: Vulnerability in Mozilla Firefox
Description
Mitigation bypass in the DOM: Copy & Paste and Drag & Drop component. This vulnerability was fixed in Firefox 156, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 140.16.
Affected software
Mozilla
Firefox
Mozilla
Thunderbird
pkg:github/mozilla/firefoxRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-92030 is a vulnerability in Mozilla Firefox's DOM Copy & Paste and Drag & Drop component that allows mitigation bypass. This flaw was fixed in Firefox 156, Firefox ESR 140.16, and Firefox ESR 153.3. The Mozilla advisories confirm the fix and classify the impact as moderate. The vulnerability was publicly disclosed on September 15, 2026, and no known exploits in the wild have been reported. The vendor advisory explicitly states the fixed versions and provides detailed references to the bug report.
Potential Impact
The vulnerability allows bypassing security mitigations in the DOM related to Copy & Paste and Drag & Drop operations, which could potentially be leveraged to circumvent security controls within the browser environment. The impact is rated moderate by Mozilla, indicating a significant but not critical risk. No active exploitation has been reported.
Mitigation Recommendations
Mozilla has released official fixes for this vulnerability in Firefox 156, Firefox ESR 140.16, and Firefox ESR 153.3. Users and administrators should update to these versions or later to remediate the issue. Since official patches are available, applying these updates is the recommended mitigation.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-09-15T12:33:50.381Z
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://www.mozilla.org/security/advisories/mfsa2026-90/","vendor":"Mozilla"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-92/","vendor":"Mozilla"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-93/","vendor":"Mozilla"}]
Threat ID: 6aa93e6255bf5e2cf5d30fe9
Added to database: 09/15/2026, 12:47:30 UTC
Last enriched: 09/15/2026, 13:31:43 UTC
Last updated: 09/16/2026, 03:18:33 UTC
Views: 9
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