CVE-2026-100800
Received Received - Intake

Firefox Sandbox Escape via Use-After-Free in Disability Access APIs

Publication date: 2026-09-29

Last updated on: 2026-09-29

Assigner: Mozilla Corporation

Description
Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox ESR 153.4 and Firefox 157.

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Meta Information

Published
2026-09-29
Last Modified
2026-09-29
Generated
2026-09-29
AI Q&A
2026-09-29
EPSS Evaluated
N/A
NVD
CVE-2026-100800
EUVD
EUVD-2026-88953

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
mozilla firefox to 153.4 (inc)
mozilla firefox to 157 (inc)

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Exploitability

CWE
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This is a sandbox escape vulnerability caused by a use-after-free error in the Disability Access APIs component of Firefox. A use-after-free occurs when a program continues to use a pointer after the memory it points to has been freed, potentially allowing an attacker to execute arbitrary code or escape the browser sandbox. The issue was patched in Firefox ESR 153.4 and Firefox 157.

Impact Analysis

This vulnerability could allow an attacker to break out of the browser sandbox and execute malicious code on your system. If exploited, it may lead to unauthorized access to sensitive data, installation of malware, or further compromise of your device. Users running unpatched versions of Firefox are at risk.

Mitigation Strategies

Update Firefox ESR to version 153.4 or later and Firefox to version 157 or later to address the sandbox escape vulnerability.

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