CVE-2026-2760 Details
Description
Sandbox escape due to incorrect boundary conditions in the Graphics: WebRender component. This vulnerability was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
A sandbox escape vulnerability has been identified in the WebRender component of Mozilla Firefox and Thunderbird. This issue arises from incorrect boundary conditions, allowing for potential unauthorized access or actions within the application sandbox. The vulnerability affects multiple versions of Firefox and Thunderbird, including Firefox versions prior to 148, Firefox ESR versions prior to 115.33 and 140.8, as well as Thunderbird versions prior to 148 and 140.8.
Users can upgrade to Firefox 148 or Thunderbird 148. For Firefox ESR users, version 140.8 is available. Instructions for updating can be found in the Firefox Release Notes and the Thunderbird Release Notes.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Feb 26, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| NVD-CWE-noinfo | Insufficient Information to Classify Weakness | [email protected] |
| CWE-1384 | Improper Handling of Physical or Environmental Conditions | CISA-ADP |
Affected Products
| Product | Versions |
|---|---|
| mozilla firefox | < 115.33.0 < 148.0 >= 128.0, < 140.8.0 |
CPE
Remediation
| |
| mozilla thunderbird | < 140.8.0 < 148.0 |
CPE
Remediation
| |
Change History
9 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 15, 2026 | CVE Modified | redhat-SADP |
| Jun 30, 2026 | CVE Modified | redhat-SADP |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 13, 2026 | CVE Modified | [email protected] |
| Feb 26, 2026 | CVE Modified | CISA-ADP |
| Feb 25, 2026 | Initial Analysis | [email protected] |
| Feb 24, 2026 | CVE Modified | [email protected] |
| Feb 24, 2026 | New CVE Received | [email protected] |