Microsoft has confirmed that the April 2026 cumulative updates (KB5082063 for Windows Server 2025, KB5082142 for Windows Server 2022) are causing LSASS crashes that trigger reboot loops on non-Global Catalog domain controllers in environments using Privileged Access Management (PAM). Affected DCs restart repeatedly, preventing authentication and directory services from functioning, potentially rendering the entire domain unavailable. The issue also occurs when setting up new domain controllers or on existing ones processing authentication requests early in startup. A separate bug causes the April update to fail installation entirely on some Windows Server 2025 systems with error code 0x800F0983. A third issue forces some servers into BitLocker recovery mode due to Secure Boot changes bundled in the update. This is the third consecutive year April Patch Tuesday has broken Windows Server authentication - similar LSASS/domain controller issues hit in April 2024 and April 2025.
NIST has announced major changes to how the National Vulnerability Database processes new CVEs, driven by a 263% surge in submissions that the agency can no longer keep up with. As of April 15, 2026, NIST will only provide full enrichment (CVSS scoring, CWE mapping, CPE identification) for CVEs that meet specific criteria: vulnerabilities in the CISA KEV catalog, those in software used by the federal government, and a small set of other priority categories. Everything else remains listed in the NVD but without the detailed metadata that security teams rely on for automated patch prioritization. Dustin Childs at ZDI noted during Patch Tuesday coverage that AI-driven vulnerability discovery has tripled his own triage volume. The same pressure is hitting NIST. Practical impact: vulnerability management tools, automated scanners, and patch prioritization workflows that depend on NVD enrichment data will have blind spots for the majority of new CVEs. Private vulnerability intelligence feeds (VulnCheck, Tenable, Qualys) become more important for anyone who relied on NVD as the single source of truth.
The FBI Atlanta Field Office and Indonesian authorities have dismantled the W3LL global phishing platform and arrested its alleged developer. W3LL sold a sophisticated phishing kit designed specifically for bypassing multi-factor authentication on Microsoft 365 accounts using adversary-in-the-middle (AiTM) techniques. The platform operated as a phishing-as-a-service ecosystem with its own marketplace, support channels, and licensing model, enabling thousands of business email compromise campaigns targeting corporate Microsoft 365 environments. This is described as the first coordinated international law enforcement action against this platform. Group-IB previously estimated W3LL's tools had been used to compromise over 8,000 Microsoft 365 business accounts.
Adobe has released an emergency security update (APSB26-43, priority-1) to patch CVE-2026-34621, the Adobe Reader zero-day we reported on April 10 that had been exploited since December 2025 via malicious PDF documents. The flaw has now been classified as a prototype pollution vulnerability leading to arbitrary code execution - more severe than the initial fingerprinting and data theft we described. Adobe confirmed it's worse than just information leakage: the underlying bug can achieve full RCE, not just the reconnaissance stage observed in early exploitation. CVSS was initially scored 9.6 but Adobe revised it down to 8.6 after changing the attack vector from Network to Local. EXPMON researcher Haifei Li, who first disclosed the flaw, was credited by Adobe. All users on Windows and macOS should update immediately - Adobe assigned this patch its highest priority rating.
Google moved its AI-powered ransomware detection for Google Drive from beta to general availability, enabled by default for all paid Workspace users. When ransomware encrypts files on a synced desktop, Drive immediately pauses syncing to protect cloud copies, alerts both the user and IT admins, and offers bulk file restoration to roll back to pre-infection versions. Google says the GA model catches 14 times more infections than the beta, covering a wider range of encryption patterns at faster detection speeds.
In an unusual move, Apple expanded iOS 18.7.7 to cover far more devices on April 1 - breaking its normal practice of using security updates to push users to the newest OS. Around 20% of iPhones remain on iOS 18 (some by choice, some because they can't run iOS 26), and Apple now considers the DarkSword threat serious enough to backport protections rather than leave those users exposed. The update covers iPhone XR through iPhone 16e and multiple iPad generations. Devices with Automatic Updates enabled get it without user action.
Apple shipped an undocumented security feature in macOS Tahoe 26.4 that directly targets ClickFix attacks - the social engineering technique behind the Infinity Stealer campaign we covered last week. When a user tries to paste a potentially harmful command into Terminal, macOS now intercepts it with a warning before anything executes. The feature only covers Apple's built-in Terminal app, not third-party alternatives like iTerm2. A 'Paste Anyway' option remains for power users.
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