EUVD-2026-78478

Privilege escalation in the WebExtensions component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 140.16...

The vulnerability of Mozilla Firefox’s WebExtensions module allows attackers to increase their privileges.

The vulnerability of the WebExtensions module in the Mozilla Firefox browser is related to insufficient checking of permission assignment for critical resources. Exploiting this vulnerability can allow a remote attacker to increase their privileges...

The vulnerability in the WebExtensions extension of the Mozilla Firefox browser allows a hacker to gain unauthorized access to protected information, compromise its integrity, and cause service failures.

The vulnerability of the WebExtensions extension in the Mozilla Firefox browser is related to a lack of source verification mechanism. Exploiting this vulnerability can allow an attacker to gain unauthorized access to protected information, compromise its integrity, and cause service failures...

The vulnerability of the WebExtensions extension of the Mozilla Firefox browser allows a hacker to increase their privileges.

The vulnerability of the WebExtensions extension in the Mozilla Firefox browser is related to a file-saving error and subsequent unauthorized access to the file. Exploiting this vulnerability can allow attackers to gain increased privileges...

Mozilla Firefox File Execution Vulnerability

Mozilla Firefox is an open source web browser developed by the Mozilla Foundation in the United States. A security vulnerability exists in WebExtensions in versions prior to Mozilla Firefox 58. The vulnerability can be exploited by an attacker to save and open downloaded files, and run executable...