CVE-2026-92074: Vulnerability in Mozilla Firefox
Mitigation bypass in the Popup Blocker component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, and Thunderbird 156.
AI Analysis
Technical Summary
CVE-2026-92074 is a vulnerability in Mozilla Firefox's Popup Blocker component that allows a mitigation bypass. The flaw was resolved in Firefox 156 and Firefox ESR 153.3. The vendor advisory confirms the fix and categorizes the impact as high. There are no reports of active exploitation. The vulnerability is part of a broader set of security fixes released simultaneously by Mozilla.
Potential Impact
The vulnerability allows bypassing the popup blocking mechanism in Firefox, which could lead to unwanted popups being displayed despite the browser's protections. This may degrade user experience and could be leveraged in broader attack scenarios involving social engineering or unwanted content delivery. The impact is rated high by Mozilla.
Mitigation Recommendations
Mozilla has released an official fix for this vulnerability in Firefox 156 and Firefox ESR 153.3. Users and administrators should update to these versions or later to fully mitigate the risk. No additional mitigation steps are required beyond applying the update.
CVE-2026-92074: Vulnerability in Mozilla Firefox
Description
Mitigation bypass in the Popup Blocker component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, and Thunderbird 156.
Affected software
Mozilla
Firefox
Mozilla
Thunderbird
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-92074 is a vulnerability in Mozilla Firefox's Popup Blocker component that allows a mitigation bypass. The flaw was resolved in Firefox 156 and Firefox ESR 153.3. The vendor advisory confirms the fix and categorizes the impact as high. There are no reports of active exploitation. The vulnerability is part of a broader set of security fixes released simultaneously by Mozilla.
Potential Impact
The vulnerability allows bypassing the popup blocking mechanism in Firefox, which could lead to unwanted popups being displayed despite the browser's protections. This may degrade user experience and could be leveraged in broader attack scenarios involving social engineering or unwanted content delivery. The impact is rated high by Mozilla.
Mitigation Recommendations
Mozilla has released an official fix for this vulnerability in Firefox 156 and Firefox ESR 153.3. Users and administrators should update to these versions or later to fully mitigate the risk. No additional mitigation steps are required beyond applying the update.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-09-15T12:34:35.643Z
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://www.mozilla.org/security/advisories/mfsa2026-90/","vendor":"Mozilla"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-93/","vendor":"Mozilla"}]
Threat ID: 6aa941d955bf5e2cf5d76a3c
Added to database: 09/15/2026, 13:02:17 UTC
Last enriched: 09/15/2026, 13:16:56 UTC
Last updated: 09/16/2026, 03:18:27 UTC
Views: 9
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