U.S. Department of Homeland Security Urges Firefox Users to Install Update Amid Active Attack

The United States Cybersecurity and Infrastructure Agency (CISA), part of the Department of Homeland Security, this week urged customers who are using the Firefox browser to upgrade to version 72.0.1, as there is a major vulnerability in older versions of the Firefox browser.

firefoxbrowser
Mozilla released Firefox 72.0.1 on Wednesday to address a security issue that allows malicious entities to run unauthorized code on a target computer through a webpage, letting them take control of an affected system. From Mozilla:

Incorrect alias information in IonMonkey JIT compiler for setting array elements could lead to a type confusion. We are aware of targeted attacks in the wild abusing this flaw.

As the above quote states, there are known targeted attacks exploiting this flaw, which means it's important for all Firefox users to upgrade, including enterprise users.

The vulnerability was first discovered by Chinese company Qihoo 360 two days after the release of Firefox 72, but there is no word on how long the bug has been exploited nor who used the vulnerability or who might have been targeted. This is the third zero-day vulnerability that Mozilla has addressed within the last year, with the company patching two other major vulnerabilities in June 2019.

MacRumors readers who use Firefox for Mac but have not installed the latest version should make sure to do so. The latest version of Firefox can be downloaded from the Mozilla website or through the update function within Firefox itself.

Popular Stories

airpods pro 3 purple

New, Higher End AirPods Pro Coming This Year

Tuesday January 20, 2026 9:05 am PST by
Apple is planning to debut a high-end secondary version of AirPods Pro 3 this year, sitting in the lineup alongside the current model, reports suggest. Back in September 2025, supply chain analyst Ming-Chi Kuo reported that Apple is planning to introduce a successor to the AirPods Pro 3 in 2026. This would be somewhat unusual since Apple normally waits around three years to make major...
smaller dynamic island iphone 18 pro Filip Vabrous%CC%8Cek

iPhone 18 Pro Leak: Smaller Dynamic Island, No Top-Left Camera Cutout

Tuesday January 20, 2026 2:34 am PST by
Over the last few months, rumors around the iPhone 18 Pro's front-panel design have been conflicted, with some supply-chain leaks pointing to under-display Face ID, reports suggesting a top-left hole-punch camera, and debate over whether the familiar Dynamic Island will shrink, shift, or disappear entirely. Today, Weibo-based leaker Instant Digital shared new details that appear to clarify the ...
Apple Logo Spotlight

Apple Expected to Unveil Five All-New Products This Year

Wednesday January 21, 2026 10:54 am PST by
In addition to updating many of its existing products, Apple is expected to unveil five all-new products this year, including a smart home hub, a Face ID doorbell, a MacBook with an A18 Pro chip, a foldable iPhone, and augmented reality glasses. Below, we have recapped rumored features for each product. Smart Home Hub Apple home hub (concept) Apple's long-rumored smart home hub should...
Liquid Glass App Store Feature

App Store and Apple TV Experiencing Outage

Tuesday January 20, 2026 4:36 pm PST by
Apple's App Store, iTunes Store, and Apple TV service are experiencing an outage at the current time, according to Apple's System Status page. Apple says that some users may be experiencing issues with the App Store and iTunes Store. Apple also says some users may be seeing intermittent issues with Apple TV. The Apple TV Channels feature is down too, and users may be unable to access some...
airtag prime day 2

Apple Developing AirTag-Sized AI Pin With Dual Cameras

Wednesday January 21, 2026 12:31 pm PST by
Apple is working on a small, wearable AI pin equipped with multiple cameras, a speaker, and microphones, reports The Information. If it actually launches, the AI pin will likely run the new Siri chatbot that Apple plans to unveil in iOS 27. The pin is said to be similar in size to an AirTag, with a thin, flat, circular disc shape. It has an aluminum and glass shell, and two cameras at the...

Top Rated Comments

phr0z3n Avatar
79 months ago
That does it I'm going back to Netscape Navigator.
Score: 35 Votes (Like | Disagree)
ghanwani Avatar
79 months ago
see, told ya to stick with chrome! with chrome, only google can steal your stuff, nobody else.
Score: 31 Votes (Like | Disagree)
M-Life Avatar
79 months ago

see, told ya to stick with chrome! with chrome, only google can steal your stuff, nobody else.
Chrome becomes more and more like the old Internet Explorer every day. The browser for people who aren't "tech savvy" and don't know computers.
Score: 25 Votes (Like | Disagree)
pointy Avatar
79 months ago

I only have Firefox for the rare website that doesn't work under Safari.
Opposite
Score: 24 Votes (Like | Disagree)
oneMadRssn Avatar
79 months ago
Firefox is pretty awesome on MacOS. Having actual functional extensions makes it absolutely worth it over Safari.
Score: 23 Votes (Like | Disagree)
Plutonius Avatar
79 months ago
I only have Firefox for the rare website that doesn't work under Safari.
Score: 22 Votes (Like | Disagree)