CVE-2026-92043

Received Received - Intake

Privilege Escalation in Firefox Audio/Video Component

Publication date: 2026-09-15

Last updated on: 2026-10-05

Assigner: Mozilla Corporation

Description

Privilege escalation due to incorrect boundary conditions in the Audio/Video component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, and Thunderbird 156.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-09-15

Last Modified

2026-10-05

Generated

2026-10-05

AI Q&A

2026-09-15

EPSS Evaluated

2026-10-04

NVD

CVE-2026-92043

EUVD

EUVD-2026-78506

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	thunderbird	From 154.0 (inc) to 156.0 (exc)
mozilla	firefox	to 153.3.0 (exc)
mozilla	firefox	From 154.0.0 (inc) to 156.0.0 (exc)
mozilla	thunderbird	to 153.3.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-120	The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.

Attack-Flow Graph

Executive Summary

This is a privilege escalation vulnerability caused by incorrect boundary conditions in Firefox's Audio/Video component. It allows an attacker to gain higher privileges than intended, potentially taking control of the affected system.

Detection Guidance

This vulnerability is specific to Firefox versions before 156 and Firefox ESR before 153.3. To detect it, check the installed version of Firefox or Firefox ESR on your system. For Firefox, run: firefox --version. For Firefox ESR, run: firefox --version or check your package manager (e.g., apt list --installed | grep firefox). If the version is below the fixed versions, the system is vulnerable.

Impact Analysis

If exploited, this vulnerability could allow an attacker to execute arbitrary code, install malware, or access sensitive data on your system. Users of vulnerable Firefox versions are at risk until they update to Firefox 156 or Firefox ESR 153.3.

Compliance Impact

The provided CVE data does not specify direct impacts on compliance with standards like GDPR or HIPAA. However, privilege escalation vulnerabilities can potentially lead to unauthorized access to sensitive data, which may violate confidentiality requirements under GDPR and HIPAA.

Mitigation Strategies

Update Firefox to version 156 or later and Firefox ESR to version 153.3 or later to address the privilege escalation vulnerability in the Audio/Video component.

Hi! I’m here to help you understand CVE-2026-92043. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70