CVE-2026-92012: Vulnerability in Mozilla Firefox
Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, and Thunderbird 140.16.
AI Analysis
Technical Summary
The vulnerability identified as CVE-2026-92012 involves privilege escalation resulting from incorrect boundary conditions in the Graphics: CanvasWebGL component of Mozilla Firefox. This flaw could allow an attacker to gain elevated privileges within the browser context. Mozilla has fixed this vulnerability in Firefox 156 and the specified ESR versions. The vendor advisories confirm the high impact severity and provide patches in these releases.
Potential Impact
Successful exploitation of this vulnerability could allow an attacker to escalate privileges within the Firefox browser environment, potentially leading to unauthorized actions or access. The vendor classifies the impact as high, indicating significant security implications if unpatched.
Mitigation Recommendations
Mozilla has released official fixes for this vulnerability in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, and Firefox ESR 153.3. Users and administrators should update to these versions or later to remediate the issue. No additional mitigation steps are indicated by the vendor advisory.
CVE-2026-92012: Vulnerability in Mozilla Firefox
Description
Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, and Thunderbird 140.16.
CVSS v3.1
Score 8.8high
Affected software
Mozilla
Firefox
Mozilla
Thunderbird
pkg:github/mozilla/firefox-esrRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability identified as CVE-2026-92012 involves privilege escalation resulting from incorrect boundary conditions in the Graphics: CanvasWebGL component of Mozilla Firefox. This flaw could allow an attacker to gain elevated privileges within the browser context. Mozilla has fixed this vulnerability in Firefox 156 and the specified ESR versions. The vendor advisories confirm the high impact severity and provide patches in these releases.
Potential Impact
Successful exploitation of this vulnerability could allow an attacker to escalate privileges within the Firefox browser environment, potentially leading to unauthorized actions or access. The vendor classifies the impact as high, indicating significant security implications if unpatched.
Mitigation Recommendations
Mozilla has released official fixes for this vulnerability in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, and Firefox ESR 153.3. Users and administrators should update to these versions or later to remediate the issue. No additional mitigation steps are indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-09-15T12:33:31.399Z
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://www.mozilla.org/security/advisories/mfsa2026-90/","vendor":"Mozilla"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-91/","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: 6aa93e5e55bf5e2cf5d30fcc
Added to database: 09/15/2026, 12:47:26 UTC
Last enriched: 09/15/2026, 13:33:01 UTC
Last updated: 09/15/2026, 19:47:09 UTC
Views: 4
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