A cascading authentication failure in Microsoft's Exchange Online infrastructure knocked Anthropic's Claude, OpenAI's ChatGPT, xAI's Grok, and Google's Gemini offline starting August 31, with Microsof…
Microsoft is working to resolve a widespread Microsoft 365 outage that has entered its second day, with search and other functions across Exchange Online, SharePoint, OneDrive, Teams, and Microsoft 36…
Proofpoint's threat research team reported that attackers exploited OAuth client ID spoofing to enumerate Microsoft Entra ID accounts without successful sign-ins, with two campaigns using fabricated a…
Microsoft has issued CVE-2026-55145 for cross-domain prompt injection vulnerabilities in Microsoft 365 Copilot that allowed attacker-controlled email body content to influence Copilot responses, fabri…