CVE-2026-2761
Received
Received - Intake
Sandbox Escape in Firefox WebRender Component Prior to
Publication date: 2026-02-24
Last updated on: 2026-04-13
Assigner: Mozilla Corporation
Description
Description
Sandbox escape 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.
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| mozilla | firefox | to 148.0 (exc) |
| mozilla | thunderbird | to 148.0 (exc) |
| mozilla | firefox | to 115.33.0 (exc) |
| mozilla | firefox | From 128.0 (inc) to 140.8.0 (exc) |
| mozilla | thunderbird | to 140.8.0 (exc) |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-693 | The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product. |
Attack-Flow Graph
AI Powered Q&A
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
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How can this vulnerability be detected on my network or system? Can you suggest some commands?
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What immediate steps should I take to mitigate this vulnerability?
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Can you explain this vulnerability to me?
This vulnerability is a sandbox escape in the Graphics: WebRender component of Firefox. It affects versions of Firefox earlier than 148, Firefox ESR earlier than 115.33, and Firefox ESR earlier than 140.8.
How can this vulnerability impact me? :
Exploiting this vulnerability could allow an attacker to escape the sandbox environment in the WebRender graphics component, potentially leading to unauthorized access or control beyond the intended restricted environment.
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