CVE-2026-8953: Sandbox escape due to use-after-free in the Disability Access APIs component

Published May 19, 2026
·
Updated

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.

Affected Software

9 affected componentsFixes available
Mozilla Firefox ESR<115.36
115.36
Mozilla Firefox<151
151
Mozilla Firefox ESR<140.11
140.11
Mozilla Thunderbird<151
151
Mozilla Thunderbird<140.11
140.11
Mozilla Firefox<115.36.0
Mozilla Firefox<151.0.0
Mozilla Firefox>=140.0<140.11.0
Mozilla Thunderbird<140.11

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 115.36
  2. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 151
  3. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 140.11
  4. Upgrade

    Upgrade Mozilla Firefox to a version that resolves this vulnerability.

    Fixed in 151
  5. Upgrade

    Upgrade Mozilla Firefox ESR to a version that resolves this vulnerability.

    Fixed in 115.36
  6. Upgrade

    Upgrade Mozilla Firefox ESR to a version that resolves this vulnerability.

    Fixed in 140.11
  7. Upgrade

    Upgrade Mozilla Thunderbird to a version that resolves this vulnerability.

    Fixed in 151
  8. Upgrade

    Upgrade Mozilla Thunderbird to a version that resolves this vulnerability.

    Fixed in 140.11

Event History

May 19, 2026
CVE Published
via Mozilla·12:00 AM
Data Sourced
via Mozilla·12:00 AM
DescriptionSeverityAffected Software
Updated
via Mozilla·12:00 AM
Affected Software
CVE Published
via MITRE·12:29 PM
Data Sourced
via MITRE·12:29 PM
Description
Data Sourced
via Red Hat·02:02 PM
DescriptionSeverityAffected Software
Data Sourced
via NVD·02:16 PM
DescriptionSeverityWeaknessAffected Software
Jun 29, 58424
Event
via FIRST·04:26 PM

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

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Frequently Asked Questions

1

What is the severity of CVE-2026-8953?

CVE-2026-8953 has been classified as a high severity vulnerability due to its potential for sandbox escape.

2

How do I fix CVE-2026-8953?

To fix CVE-2026-8953, update to Firefox 151, Firefox ESR 115.36 or 140.11, or Thunderbird 151 or 140.11.

3

What products are affected by CVE-2026-8953?

CVE-2026-8953 affects Mozilla Firefox versions prior to 151, Firefox ESR versions prior to 115.36 and 140.11, and Thunderbird versions prior to 151 and 140.11.

4

What is a sandbox escape in the context of CVE-2026-8953?

A sandbox escape allows malicious code to break out of the security restrictions imposed by the browser or application, potentially leading to further exploitation.

5

How was CVE-2026-8953 discovered?

CVE-2026-8953 was identified through ongoing security research and reported as a use-after-free vulnerability in the Disability Access APIs.

Company

Resources

Contact

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CVE-2026-8953 - Sandbox escape due to use-after-free in the Disability Access APIs component - SecAlerts