Patch-Tuesday
SharePoint CVE-2026-45659: Site Member Permissions Are Enough to Pop the Farm
Microsoft patched CVE-2026-45659, an 8.8-severity SharePoint deserialization RCE that only requires Site Member permissions — the lowest tier any authenticated user can have.
Outlook CVE-2026-40361: Zero-Click Word RCE Resurrects BadWinmail's Enterprise-Killer Class
A use-after-free in a shared Office DLL lets a malicious message fire RCE through the Outlook Reading Pane and Explorer Preview Pane. Microsoft rates exploitation 'more likely.'
Every Windows Endpoint is a Target: CVE-2026-41096 Heap Overflow in DNS Client Enables Remote Code Execution
CVE-2026-41096 is a CVSS 9.8 heap overflow in the Windows DNS Client. A single malicious DNS response can yield code execution on any Windows host — no auth, no user click, no document opened. The blast radius is every Windows endpoint that resolves a name.
Windows Netlogon CVE-2026-41089: Unauthenticated RCE on Every Domain Controller
May Patch Tuesday's marquee bug is a stack-based buffer overflow in MS-NRPC that hands SYSTEM on any domain controller reachable over the network. Patch DCs first, before anything else.
Cisco Catalyst SD-WAN Manager: Three CVEs Land on CISA KEV With April 28 Federal Deadline
CISA added CVE-2026-20122, CVE-2026-20128, and CVE-2026-20133 in Cisco Catalyst SD-WAN Manager (vManage) to the KEV catalog on April 20, 2026. Two of the three were confirmed exploited in the wild by Cisco PSIRT in March; together they let an attacker move from low-privilege API access to full vManage takeover.
Microsoft April 2026 Patch Tuesday Fixes 167 Flaws Including Actively Exploited SharePoint Zero-Day
Microsoft's second-largest Patch Tuesday ever addresses 167 vulnerabilities, including an actively exploited SharePoint XSS flaw and a critical CVSS 9.8 Windows IKE remote code execution bug.