CVE-2026-8953
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Sandbox Escape via Use-After-Free in Firefox

Publication date: 2026-05-19

Last updated on: 2026-05-19

Assigner: Mozilla Corporation

Description
Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox 151, Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
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Meta Information
Published
2026-05-19
Last Modified
2026-05-19
Generated
2026-06-10
AI Q&A
2026-05-19
EPSS Evaluated
2026-06-08
NVD
CVE-2026-8953
EUVD
EUVD-2026-30901
Affected Vendors & Products
Showing 4 associated CPEs
Vendor Product Version / Range
mozilla firefox From 140.0 (inc) to 140.11.0 (exc)
mozilla firefox to 151.0.0 (exc)
mozilla firefox to 115.36.0 (exc)
mozilla thunderbird to 140.11 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-416 The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
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Compliance Impact

The vulnerability is a sandbox escape due to a use-after-free in the Disability Access APIs component, which has a high CVSS score indicating critical impact on confidentiality, integrity, and availability.

Such a vulnerability could potentially allow attackers to execute arbitrary code and escape sandbox protections, leading to unauthorized access or manipulation of sensitive data.

This kind of security flaw may impact compliance with standards like GDPR and HIPAA, which require protection of personal and sensitive information against unauthorized access and breaches.

However, the provided information does not explicitly describe the direct effects on compliance with these regulations.

Executive Summary

This vulnerability is a sandbox escape caused by a use-after-free issue in the Disability Access APIs component of Firefox. A use-after-free occurs when a program continues to use memory after it has been freed, which can lead to unexpected behavior or security issues.

Impact Analysis

This vulnerability could allow an attacker to escape the browser's sandbox, potentially leading to execution of arbitrary code or gaining higher privileges on the affected system.

Mitigation Strategies

To mitigate this vulnerability, update Firefox to version 151 or later, or update Firefox ESR to version 115.36 or later, or ESR 140.11 or later, where the issue has been fixed.

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