CVE-2026-0881
Unknown Unknown - Not Provided
Sandbox Escape in Firefox Messaging System Prior to

Publication date: 2026-01-13

Last updated on: 2026-04-13

Assigner: Mozilla Corporation

Description
Sandbox escape in the Messaging System component. This vulnerability was fixed in Firefox 147 and Thunderbird 147.
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Meta Information
Published
2026-01-13
Last Modified
2026-04-13
Generated
2026-06-16
AI Q&A
2026-01-14
EPSS Evaluated
2026-06-15
NVD
CVE-2026-0881
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
mozilla firefox to 147 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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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.
CWE-284 The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
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Executive Summary

This vulnerability is a sandbox escape in the Messaging System component of Firefox versions earlier than 147. It allows an attacker to break out of the restricted environment (sandbox) designed to isolate processes, potentially enabling them to execute arbitrary code or perform unauthorized actions outside the sandbox.

Impact Analysis

The vulnerability has a critical impact, with a CVSS score of 10.0, meaning it can be exploited remotely without any privileges or user interaction. Successful exploitation can lead to complete compromise of confidentiality, integrity, and availability of the affected system, allowing attackers to execute arbitrary code and take full control.

Mitigation Strategies

Update Firefox to version 147 or later, as the vulnerability affects Firefox versions prior to 147 and was fixed in Firefox 147. [1]

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