These issues were fixed in Firefox 101. The latest version of the browser is available in the latest version of the browser is available in the Mozilla Stable channel. Firefox users should update their installations as soon as possible. Earlier this month, Mozilla also released Firefox ESR (Extended Support Release), a version of the browser that receives security updates for at least 6 months after the release of a new Firefox version.
signing of Firefox ESR packages to ensure that attackers won't be able to sneak in malicious code through the update process. Mozilla is making sure that its developer ecosystem is aware of these issues and that future releases are tested with the same level of scrutiny as the Stable channel.


Soruce: Mozilla
Mozilla is aware of a vulnerability in Firefox where malicious code can be injected through the update process.
It's hard to know if you are running the latest version of Firefox. You can check your current version by going to about:addons in the browser's address bar and clicking on "Check for Updates." Or, you can download and install the latest version of Firefox from

Firefox 101 security updates

So far, Mozilla has released Firefox 101.2, which is the first security update for this version of the browser. This update includes fixes for over 30 vulnerabilities that are rated as high severity and could potentially be exploited to crash Firefox or execute arbitrary code on a user's computer.
Other updates include fixes for issues related to WebRTC, PDF Viewer, NPAPI plugins and more.
The latest version of Firefox is available in the Mozilla Stable channel, so users can install it quickly and get the most up-to-date security fixes. If you have not upgraded your browser yet, it’s time to do so because your current version of Firefox may also be affected by these vulnerabilities.

How to check if you're vulnerable?

If you haven't updated your installation of Firefox to the latest version, it's possible that you are still vulnerable. To check if you're vulnerable and need to update, use the "Check for Updates" option in the menu bar. If an update is available, download and install it immediately.

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Mozilla Security Advisory: MSA-201805-01

A security issue has been discovered in Firefox. The issue results from a memory corruption bug and is addressed by upgrading to Firefox 101, which contains a fix for the problem.
Both users and administrators are encouraged to review the Mozilla Security Advisories for 201805-01 at for further information about this critical issue.

Installation of unsigned Firefox ESR packages can be an attack vector

The developer of an unsigned ESR version of Firefox could make changes that would allow attackers to inject malicious code into the update process. With Mozilla's new signing process, this attack vector was closed in Firefox 101.


Published on: 12/22/2022 20:15:00 UTC
Last modified on: 01/03/2023 20:21:00 UTC