CVE-2026-92048

What it is

Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.

At a glance

Exploitability

Can be exploited over the network with a low-privilege account, but needs a user to act. High risk of data exposure, data tampering, service disruption.

Exploit odds

0.3% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-09-15 13:16 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-10-05 18:44 UTC Last updatedMost recent change to the record

Details

Published

2026-09-15 13:16 UTC

Last modified

2026-10-05 18:44 UTC

Exploit probability

0.3% · EPSS, next 30 days

Weakness

CWE-119 · Buffer errors

Record status

Analyzed

Affected

• Mozilla Firefox < 153.3.0
• Mozilla Firefox < 156.0.0
• Mozilla Thunderbird < 153.3.0
• Mozilla Thunderbird < 156.0

Attack profile CVSS 3.1 · 9.0

Attack vector

Network

Complexity

Low

Privileges needed

Low

User interaction

Required

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High