CVE-2026-92016 - Vulnerability Details

- Use-after-free in the Disability Access APIs component

Description

Use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox 156, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.

Published: 2026-09-15

Score: 8.8 High

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Impact

The flaw is a use‑after‑free within the Disability Access APIs component. After an API call frees an object, the application may later dereference the same memory address, leading to memory corruption. If an attacker can trigger the vulnerable sequence, it could enable arbitrary code execution or cause a denial of service.

Affected Systems

Mozilla Firefox versions earlier than 156, Firefox ESR versions earlier than 140.16 or 153.3, Thunderbird versions earlier than 156, Thunderbird ESR versions earlier than 140.16 or 153.3, all operating systems for which those browsers are available.

Risk and Exploitability

The CVSS score of 8.8 indicates the vulnerability is considered high severity, but the EPSS score of less than 1% indicates a low probability of exploitation at this time. The vulnerability is not listed in the CISA KEV catalog. Attackers would need to exploit the Disability Access APIs, possibly via crafted web content or a local action that triggers the freed memory reuse; the exact vector is not publicly defined, so a cautious approach is required.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Mozilla

Firefox

affected

Version	Status	Constraints
`140.16`	unaffected	≤ 140.*
`153.3`	unaffected	≤ 153.*
`156`	unaffected	≤ *

Mozilla

Thunderbird

affected

Version	Status	Constraints
`140.16`	unaffected	≤ 140.*
`153.3`	unaffected	≤ 153.*
`156`	unaffected	≤ *

No data.

Vendor Product Confidence Versions

Mozilla

Firefox

100%

Version	Status	Scheme	Platform
`[140.16,140.*]`	unaffected	generic	—
`[153.3,153.*]`	unaffected	generic	—
`[156,*]`	unaffected	generic	—

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Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Update Firefox to version 156 or later (or ESR 140.16 or 153.3) and Thunderbird to version 156 or later (or ESR 140.16 or 153.3) to apply the vendor patch.
Maintain operating‑system and browser security updates on a regular basis; monitor Mozilla advisory channels for future patches.
If an immediate upgrade is not possible, run the browsers inside a sandbox or container that limits memory access and keeps the host OS patched to reduce the overall risk.

Generated by OpenCVE AI on September 20, 2026 at 17:59 UTC.

Tracking

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Advisories

Source	ID	Title
Debian DLA	DLA-4781-1	firefox-esr security update
Debian DLA	DLA-4782-1	thunderbird security update
Debian DSA	DSA-6501-1	firefox-esr security update
Debian DSA	DSA-6503-1	thunderbird security update

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00333.

Exploitation none

Automatable no

Technical Impact total

References

Link	Providers
https://bugzilla.mozilla.org/show_bug.cgi?id=2061327
https://nvd.nist.gov/vuln/detail/CVE-2026-92016
https://www.cve.org/CVERecord?id=CVE-2026-92016
https://www.mozilla.org/security/advisories/mfsa2026-90/
https://www.mozilla.org/security/advisories/mfsa2026-92/
https://www.mozilla.org/security/advisories/mfsa2026-92/#CVE-2026-92016
https://www.mozilla.org/security/advisories/mfsa2026-93/
https://www.mozilla.org/security/advisories/mfsa2026-94/
https://www.mozilla.org/security/advisories/mfsa2026-95/
https://www.mozilla.org/security/advisories/mfsa2026-95/#CVE-2026-92016
https://www.mozilla.org/security/advisories/mfsa2026-96/

History

Sun, 20 Sep 2026 01:30:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-416
Metrics	cvssV3_1 `{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H'}`	ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}` cvssV3_1 `{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'}`

Thu, 17 Sep 2026 20:30:00 +0000

Type	Values Removed	Values Added
Weaknesses	CWE-476 CWE-762

Thu, 17 Sep 2026 12:15:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-825
References		https://nvd.nist.gov/vuln/detail/CVE-2026-92016 https://www.cve.org/CVERecord?id=CVE-2026-92016 https://www.mozilla.org/security/advisories/mfsa2026-92/#CVE-2026-92016 https://www.mozilla.org/security/advisories/mfsa2026-95/#CVE-2026-92016
Metrics	threat_severity `None`	cvssV3_1 `{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H'}` threat_severity `Important`

Wed, 16 Sep 2026 14:45:00 +0000

Type	Values Removed	Values Added
Description	Use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox 156, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 140.16.	Use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox 156, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.
References		https://www.mozilla.org/security/advisories/mfsa2026-96/

Wed, 16 Sep 2026 05:45:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-476 CWE-762

Tue, 15 Sep 2026 20:15:00 +0000

Type	Values Removed	Values Added
Description	Use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox 156, Firefox ESR 140.16, Firefox ESR 153.3, and Thunderbird 140.16.	Use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox 156, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 140.16.
References		https://www.mozilla.org/security/advisories/mfsa2026-94/

Tue, 15 Sep 2026 20:00:00 +0000

Type	Values Removed	Values Added
Description	Use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox 156, Firefox ESR 140.16, and Firefox ESR 153.3.	Use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox 156, Firefox ESR 140.16, Firefox ESR 153.3, and Thunderbird 140.16.
References		https://www.mozilla.org/security/advisories/mfsa2026-95/

Tue, 15 Sep 2026 14:45:00 +0000

Type	Values Removed	Values Added
First Time appeared		Mozilla Mozilla firefox
Vendors & Products		Mozilla Mozilla firefox

Tue, 15 Sep 2026 12:45:00 +0000

Type	Values Removed	Values Added
Description		Use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox 156, Firefox ESR 140.16, and Firefox ESR 153.3.
Title		Use-after-free in the Disability Access APIs component
References		https://bugzilla.mozilla.org/show_bug.cgi?id=2061327 https://www.mozilla.org/security/advisories/mfsa2026-90/ https://www.mozilla.org/security/advisories/mfsa2026-92/ https://www.mozilla.org/security/advisories/mfsa2026-93/

Subscriptions

Mozilla Firefox

MITRE

Status: PUBLISHED

Assigner: mozilla

Published: 2026-09-15T12:33:35.999Z

Updated: 2026-09-20T00:33:12.955Z

Reserved: 2026-09-15T12:33:35.485Z

Link: CVE-2026-92016

Vulnrichment

Updated: 2026-09-20T00:32:56.057Z

NVD

Status : Awaiting Analysis

Published: 2026-09-15T13:16:51.247

Modified: 2026-09-20T01:16:34.487

Link: CVE-2026-92016

Redhat

Severity : Important

Publid Date: 2026-09-15T12:33:35Z

Links: CVE-2026-92016 - Bugzilla

OpenCVE Enrichment

Updated: 2026-09-20T18:00:14Z

Weaknesses

CWE-416
Use After Free
CWE-825
Expired Pointer Dereference

Impact

Affected Systems

Risk and Exploitability

Tracking

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction Required

Exploitation none

Automatable no

Technical Impact total

Subscriptions

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