Tag: Bugs

You may have forgotten about Popcorn Time. Unfortunately, its updater didn’t forget about your device.

Security researchers have intervened to disable an abandoned update mechanism in Time4Popcorn, a version of the once-popular streaming app. If left running in the background, the updater could have allowed attackers to take control of Windows and Mac computers, even if their owners hadn’t opened the app in years.

Eye Security estimates that the vulnerable updater was present on millions of devices worldwide, including 2.5–3 million Windows computers and around 250,000–350,000 Macs.

Popcorn Time made watching movies and TV shows through BitTorrent look more like browsing Netflix. Rather than making users find torrent files and open them in a separate client, it wrapped the process in a familiar streaming-style interface.

Amid concerns about copyright infringement and its possible consequences, the original developers abandoned it shortly after its launch in 2014. But because its source code was publicly available, other developers could pick it up and create their own versions, known as forks.

One of those was Time4Popcorn, which was also distributed under the name “Popcorn Time.” That shared branding matters because people may have installed the affected software without ever seeing the Time4Popcorn name.

The problem at hand

Time4Popcorn was eventually abandoned too. But its update infrastructure was left behind, and at some point the domains associated with the software became available for others to register.

In other words, the people maintaining the software had gone away. The software’s ability to accept instructions had not. Time4Popcorn’s updater used unencrypted HTTP connections and accepted executable updates without checking digital signatures to verify their authenticity. So, someone who controlled an update domain or was able to tamper with the unencrypted traffic could supply their own program instead.

That combination created a remote code execution vulnerability, tracked as CVE-2026-30612, which could let an attacker run malicious software on a device. An attacker wouldn’t need to persuade someone to watch a movie or click a suspicious attachment. The forgotten updater could do the work for them.

Although Android was affected too, users had an extra layer of protection. Its updater checked for updates when the application was opened, but installing an attacker-supplied APK required the user to approve the installation. It was not the same silent, background takeover route researchers found on Windows and macOS.

What the researchers did

Eye Security registered an abandoned update domain and used the vulnerable mechanism to distribute an update that disabled the updater itself. On Windows, it stopped and disabled the service; on macOS, it prevented the update process from starting. The researchers say their intervention did not delete users’ files or collect host data.

By March 2026, Eye Security reported more than two million downloads of its updater-disabling fix, and update requests to its domains had fallen by 98%. Later that month, it transferred the 15 domains it controlled to the nonprofit Shadowserver Foundation.

Researchers could not remotely disable the Android updater in the same way. And the desktop application still contained other weaknesses, including an obsolete Chrome engine dating from 2014 and disabled sandbox protections, which normally help contain malicious code.

What users should do

If you used Popcorn Time years ago, check the devices on which you installed it. Don’t assume that no longer using an application means its background components have stopped running.

• Check your list of installed applications for Popcorn Time or Time4Popcorn. Pay particular attention to older Windows PCs, Macs, and Android devices where you may have forgotten about installing it. The affected fork was distributed under both names.
• Remove the old application. There is no vendor security update for the abandoned Time4Popcorn software. Disabling the updater addresses one vulnerability, not the application’s other security weaknesses.
• On Windows and macOS, check that the background updater is no longer running. Eye Security identifies the Windows component as Updater.exe, normally inside a Popcorn Time folder under Program Files or Program Files (x86), running through a service called Update Service. On macOS, the component is /Library/PrivilegedHelperTools/PT.updd, with a launch daemon at /Library/LaunchDaemons/PT.updd.plist. Its advisory provides instructions for disabling these components if needed.
• On Android, uninstall the affected app rather than accepting an update prompt from it. The updater is part of the main application and cannot easily be disabled separately.
• Use an up-to-date, real-time anti-malware solution to detect and block any attempts to install malware on your devices.

As we saw recently, cybercriminals can use software updates to distribute malware. Remove abandoned apps and check for any background updaters they leave behind.

From reporting threats to removing them.

Cybersecurity risks should never spread beyond a headline. Keep threats off your devices by downloading Malwarebytes today.

Source: Malwarebytes Labs · 2026-10-26