A vulnerability in Android devices can allow attackers to gain access to a phone in less than a minute.

The vulnerability, tracked as CVE-2026-20435, affects certain MediaTek SoCs (System-on-a-Chip) using Trustonic’s TEE (Trusted Execution Environment). That may sound rare, but reportedly that’s about one in four Android phones, mostly cheaper models.

Researchers demonstrated the vulnerability by connecting a vulnerable phone to a laptop over USB, showing how their exploit recovered the handset PIN, decrypted storage, and extracted seed phrases from several software wallets.

You may argue that if an attacker has your phone, you’re already in trouble. Which is true. But the protection you rely on to keep your data safe if your phone is lost or stolen doesn’t help one bit here.

The exploit was able to extract the root keys protecting full‑disk encryption before Android fully boots and then decrypt storage. While full‑disk encryption and lock screen are supposed to be your safety net if the phone is stolen or lost, those layers fail on affected devices.

Is my phone affected?

If you’re not sure whether this vulnerability affects your mobile device, you can look up your phone on a platform like GSMArena  or your vendor’s website to see which SoC it uses, then cross‑check with MediaTek’s March Security bulletin under CVE-2026-20435.

MediaTek released a firmware patch that device manufacturers can include in security updates for their phones. So all you can do is make sure you’re fully patched with the latest security update from your manufacturer. Which, depending on the patch gaps and how far along your device is in the EOL cycle, can take anywhere from days to forever.

EOL (End-of-Life) refers to the point in a product’s lifecycle when the manufacturer stops selling, marketing, or providing full support for it.

But obviously the best advice we can give you is to keep a close eye on your phone, so it doesn’t get lost or stolen.

We don’t just report on phone security—we provide it

Cybersecurity risks should never spread beyond a headline. Keep threats off your mobile devices by downloading Malwarebytes for iOS, and Malwarebytes for Android today.

A vulnerability in Microsoft Authenticator for both iOS and Android (CVE-2026-26123) could leak your one-time sign-in codes or authentication deep links to a malicious app on the same device. 

Deep links are predefined URIs (Uniform Resource Identifiers) that allow direct access to an activity in a web or mobile application when clicked. In simple terms, they are specifically constructed links used to open an app and complete actions like signing in.

Microsoft Authenticator is a mobile app that generates time-based one-time codes and handles sign-in links and QR-based logins for Microsoft and other accounts. It is widely used for multi-factor authentication (MFA) on personal phones, including BYOD (Bring Your Own Device) devices that protect access to corporate and production services.

This vulnerability affects users who have Microsoft Authenticator installed on an iOS or Android device. For the vulnerability to be exploited, the user would first need to install a malicious app on their device and then accidentally choose that app to handle a sign‑in deep link.

If that happens, the malicious app receives the one-time code or sign-in information and can potentially use it to authenticate as the victim.​

If successful, an attacker could:

• Complete login flows to services that trust your Microsoft Authenticator codes.
• Access the information and services available to the compromised account (email, files, cloud apps, or production systems in a BYOD context).​
• Potentially pivot to additional accounts if those are also protected by codes delivered via Authenticator on the same device.

How to stay safe

The fix for CVE-2026-26123 is already included in current releases, so installing updates is the most effective mitigation.

• On iOS: Open the App Store. Tap the My Account button or your photo at the top of the screen. Scroll down to see pending updates and release notes. Tap Update next to an app to update only that app, or tap Update All.
• On Android: Open the Google Play Store app. At the top right, tap the profile icon. Tap Manage apps & device. Under “Updates available,” tap See details. Next to the app you want to update, tap Update. To update all your apps at the same time, tap Update all.

Note: If your device manufacturer has implemented a different method to apply app updates, the steps may vary slightly.

If you are temporarily unable to update the app, avoid installing new apps that request to handle authentication links, QR-based sign-ins, or web-to-app sign-in flows.

When scanning QR codes or tapping sign-in links, verify that the handler is Microsoft Authenticator or another trusted app, and not an unknown, recently installed, or otherwise suspicious app.​

Where possible, use alternative MFA options you already trust (such as built-in authentication in your password manager or platform-specific solutions like Apple’s password features) until you can apply the update.

Use anti-malware protection for your mobile devices that can help detect malicious apps.

We don’t just report on phone security—we provide it

Cybersecurity risks should never spread beyond a headline. Keep threats off your mobile devices by downloading Malwarebytes for iOS, and Malwarebytes for Android today.