CVE-2026-16356: Sandbox escape due to use-after-free in the Disability Access APIs component

Published Jul 21, 2026
·
Updated

Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

Affected Software

12 affected componentsFixes available
Mozilla Firefox<153
Mozilla Firefox ESR<115.38, <140.13
Mozilla Firefox<153
153
Mozilla Firefox ESR<115.38
115.38
Mozilla Firefox ESR<140.13
140.13
Mozilla Thunderbird<140.13
140.13
Mozilla Thunderbird<153
153
Mozilla Firefox<115.38.0
Mozilla Firefox<153.0.0
Mozilla Firefox>=128.1.0<140.13.0
Mozilla Thunderbird<140.13.0
Mozilla Thunderbird>=141.0<153.0

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 153
  2. Upgrade

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

    Fixed in 115.38
  3. Upgrade

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

    Fixed in 140.13
  4. Upgrade

    Upgrade Firefox/Thunderbird - Disability Access APIs to a version that resolves this vulnerability.

    Fixed in 153
  5. Upgrade

    Upgrade Firefox ESR - Disability Access APIs to a version that resolves this vulnerability.

    Fixed in 115.38
  6. Upgrade

    Upgrade Firefox ESR - Disability Access APIs to a version that resolves this vulnerability.

    Fixed in 140.13
  7. Upgrade

    Upgrade Thunderbird - Disability Access APIs to a version that resolves this vulnerability.

    Fixed in 153
  8. Upgrade

    Upgrade Thunderbird - Disability Access APIs to a version that resolves this vulnerability.

    Fixed in 140.13

Event History

Jul 21, 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·12:37 PM
Data Sourced
via MITRE·12:37 PM
Description
Data Sourced
via NVD·01:17 PM
DescriptionSeverityWeaknessAffected Software

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-2026-16356?

The severity of CVE-2026-16356 is critical with a CVSS score of 9.8.

2

How do I fix CVE-2026-16356?

To fix CVE-2026-16356, upgrade to Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, or Thunderbird 140.13.

3

What type of vulnerability is CVE-2026-16356?

CVE-2026-16356 is a sandbox escape vulnerability caused by a use-after-free issue in the Disability Access APIs component.

4

What products are affected by CVE-2026-16356?

CVE-2026-16356 affects Mozilla Firefox, Mozilla Firefox ESR, and Mozilla Thunderbird.

5

When was CVE-2026-16356 published?

CVE-2026-16356 was published on July 21, 2026.

Company

Resources

Contact

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