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April 2026 Windows Update Breaks Third-Party Backup Software by Blocking Vulnerable Driver
Winsage
May 5, 2026

April 2026 Windows Update Breaks Third-Party Backup Software by Blocking Vulnerable Driver

Microsoft will include the psmounterex.sys driver in its Vulnerable Driver Blocklist in the April 2026 security update, affecting third-party backup applications that use this driver for image mounting and Volume Shadow Copy Service (VSS) snapshots. This decision addresses CVE-2023-43896, a critical buffer overflow vulnerability. Affected software includes Macrium Reflect, Acronis Cyber Protect Cloud, UrBackup Server, and NinjaOne Backup on Windows 11, Windows 10, and Windows Server platforms. Users may face issues during image-mount operations, receiving error messages related to VSS timeouts and Code Integrity errors in the Event Viewer. To check if a system is affected, users can look for Event ID 3077 in the Code Integrity Operational log. Microsoft recommends upgrading to newer versions of backup applications that do not use blocked drivers and advises against uninstalling or delaying the April update. Additionally, the update may cause certain Windows Server 2025 devices to boot into BitLocker recovery mode and has led to out-of-band updates for Windows Server update failures and restart loops on domain controllers.
ScarCruft Hacks Gaming Platform to Deploy BirdCall Malware on Android and Windows
BetaBeacon
May 5, 2026

ScarCruft Hacks Gaming Platform to Deploy BirdCall Malware on Android and Windows

ScarCruft compromised a video game platform in a supply chain attack, trojanizing its components with a backdoor called BirdCall to target ethnic Koreans residing in China. The attack enabled the threat actors to target both Windows and Android devices, turning it into a multi-platform threat. The campaign targeted sqgame[.]net, a gaming platform used by ethnic Koreans in China, known as a transit point for North Korean defectors. BirdCall has features like screenshot capture, keystroke logging, and data gathering, and relies on legitimate cloud services for command-and-control. The Android variant collects various data and has seen active development.
Meta enhances security of WhatsApp and Messenger encrypted backups
AppWizard
May 5, 2026

Meta enhances security of WhatsApp and Messenger encrypted backups

Meta has enhanced the security and transparency of its end-to-end encrypted backup system for WhatsApp and Messenger. The improvements focus on refining the distribution and verification of encryption keys, and allow for independent audits of certain infrastructure components. The updates are based on Meta's Hardware Security Module (HSM)-based Backup Key Vault architecture, which securely stores recovery secrets in tamper-resistant hardware, ensuring that neither Meta nor cloud service providers can access users' message archives. For encrypted backups, users' devices generate a 256-bit encryption key locally, which encrypts all backup data before uploading it to cloud storage. The key remains on the device in an encrypted format, with the user's password not visible to Meta or third parties. An encrypted version of the backup key is stored in the HSM-based vault using the OPAQUE password-authenticated key exchange protocol, enhancing recovery security without revealing the password. The recent updates include an over-the-air (OTA) fleet key distribution mechanism, which avoids hardcoding trusted infrastructure keys into Messenger applications. Clients receive a “validation bundle” containing the HSM fleet's public keys during runtime, with signatures verified against Cloudflare’s Key Transparency system. The vault operates across at least seven data centers using majority-consensus replication to ensure availability and integrity. Meta plans to publish cryptographic proof of each new HSM fleet deployment, allowing advanced users and researchers to verify these deployments through the open-source “mbt” (Meta Binary Transparency) CLI tool, which conducts multiple checks to confirm that fleet keys are untampered.
The best mobile antivirus software of 2026: Expert tested and reviewed
Tech Optimizer
May 5, 2026

The best mobile antivirus software of 2026: Expert tested and reviewed

Bitdefender Mobile Security is currently regarded as the best mobile antivirus software, achieving a 100% detection rate for malware on Android devices according to AV-TEST's August 2025 report. The 2026 version introduces App Anomaly Detection and includes features like Scam Alert and anti-theft tools. Sophos Intercept X for Mobile offers a free version with a perfect score in AV-TEST's comparisons and features such as multi-factor authentication and a Privacy Advisor. Surfshark Antivirus, part of the Surfshark One package, scored six out of six in AV-TEST's evaluations and includes various security tools, but is only available for Android, macOS, and Windows. Avast Mobile Security is a popular free option with robust features and achieved perfect scores in protection and usability in AV-TEST's September-October 2025 report. AVG Antivirus, operating on the same engine as Avast, also detected 100% of malware in AV-TEST's March-April 2025 evaluations and includes anti-theft tools.
Defender yanks root certs as Windows updates blocks backups
Winsage
May 5, 2026

Defender yanks root certs as Windows updates blocks backups

Microsoft's Defender anti-malware tool update version 1.449.425.0 removed two DigiCert root digital certificates, leading to false positives that flagged them as severe malware (Trojan:Win32/Cerdigent.A!dha). This incident was later identified as a false positive, and updating to version 1.449.430.0 or later reinstates the certificates. The issue may be linked to a DigiCert employee encountering disguised malware. Additionally, Windows updates from April 14 caused third-party backup applications to malfunction due to the addition of vulnerable psmounterex.sys kernel driver versions to a blocklist. Users experienced difficulties with mounting backup image files, and Microsoft referenced a vulnerability rated 9.3 out of 10 in the driver. Other affected software includes Acronis Cyber Protect Cloud and UrBackup server. Microsoft has not explained the delay in adding the vulnerable driver to the blocklist, and other recent update-related issues have also been reported.
Microsoft confirms April Windows updates cause backup failures
Winsage
May 4, 2026

Microsoft confirms April Windows updates cause backup failures

Microsoft has acknowledged that the April 2026 security updates have disrupted the functionality of various third-party backup applications using the psmounterex.sys driver, raising concerns among users. The issue primarily affects software leveraging the Volume Shadow Copy Service (VSS) snapshots, leading to failures due to VSS service timeouts. Notable impacted products include Macrium Reflect, Acronis Cyber Protect Cloud, UrBackup Server, and NinjaOne Backup, used on Windows 11, Windows Server, and Windows 10 devices. Disruptions can manifest as failures to mount backup image files, errors or timeouts when browsing or restoring from backup images, and error messages related to VSS timeouts. Microsoft updated its support documentation to clarify that the April updates included a security hardening change that added psmounterex.sys to the vulnerable driver blocklist to protect against a high-severity buffer overflow vulnerability (CVE-2023-43896). Affected users are advised to upgrade to newer application versions with updated drivers and not to uninstall or pause the security update. Users can check if the Microsoft Vulnerable Driver Blocklist is blocking a driver by looking for Event ID 3077 in the Code Integrity Operational log. Additionally, Microsoft has alerted users that some Windows Server 2025 devices may boot into BitLocker recovery mode after installing the KB5082063 update and has issued out-of-band updates to address installation failures and restart loops affecting Windows Server systems after the April 2026 updates.
Two More 'Day One' Game Pass Titles Quietly Announced For 2026
AppWizard
May 4, 2026

Two More ‘Day One’ Game Pass Titles Quietly Announced For 2026

Two new titles will join Xbox Game Pass in 2026: 1. Corsair Cove (PC, TBD 2026) - A city-builder set during the Golden Age of Piracy, where players battle against pirate hunters and manage a pirate haven. The exact release date is not specified but is confirmed for later this year. 2. Mariachi Legends (Xbox Series X, S, PC, Cloud, Q4 2026) - A pixel art Metroidvania game featuring intense combat in Mexico, where players control Pablo Cruz, a detective who can transform into La Sombra to fight evil. Both games will be available on day one through Xbox Game Pass.
Microsoft Defender wrongly flags DigiCert certs as Trojan:Win32/Cerdigent.A!dha
Tech Optimizer
May 4, 2026

Microsoft Defender wrongly flags DigiCert certs as Trojan:Win32/Cerdigent.A!dha

Microsoft Defender mistakenly flagged legitimate DigiCert root certificates as Trojan:Win32/Cerdigent.A!dha, leading to their removal from Windows systems globally. This issue arose after a Defender signature update on April 30th, with affected certificates including 0563B8630D62D75ABBC8AB1E4BDFB5A899B24D43 and DDFB16CD4931C973A2037D3FC83A4D7D775D05E4. The certificates were removed from the AuthRoot store under the Registry key HKLMSOFTWAREMicrosoftSystemCertificatesAuthRootCertificates. Microsoft has addressed the issue in Security Intelligence update version 1.449.430.0, which also restored the removed certificates. The false positives were linked to detections related to a recent DigiCert breach, where threat actors obtained valid code-signing certificates used for signing malware. DigiCert revoked 60 code-signing certificates, including those linked to the "Zhong Stealer" malware campaign. The malware utilized certificates issued to companies like Lenovo and Kingston, but the certificates flagged by Microsoft Defender are root certificates and do not correspond to the revoked code-signing certificates.
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