InfoSecBulletin Cybersecurity for mankind
Microsoft is looking into a problem with Outlook security alerts when trying to open .ICS calendar files after installing December 2023 Patch Tuesday Office security updates.
Hackers deploy Casbaneiro Trojan that activates on bank websites
German police read Signal, Telegram, WhatsApp messages without breaking encryption
Urgent Patch! cPanel, GitLab Flaws Expose Users to RCE, File and Credential Theft
Palo Alto PAN-OS Flaw Enables Root Arbitrary Code Execution
Critical Check Point VPN flaws allow remote code execution attacks
Cisco confirms CVE-2026-20079 flaw in Secure FMC is exploited in attacks
Hackers exploit PaperCut flaws using hundreds of AI agents, compromising 440 servers globally
CISA Says Chinese Firms Extracted Billions of Tokens From Frontier AI Models
Nightmare Eclipse Drops New Microsoft Defender ‘ShieldCrash’ zero-day
cPanel Flaw Lets Hosting Accounts With Mail Privileges Execute Code as Root
Microsoft 365 users report a problem that they receive warning messages when they try to open locally saved ICS files. The messages indicate a possible security risk.
“This behavior is not expected when opening .ICS files. This is a bug and will be addressed in a future update,” Microsoft explains in this support document.
The company announced that a security warning will appear after installing an update that fixes the CVE-2023-35636 Microsoft Outlook information disclosure vulnerability.
If not fixed, the security flaw can be used by attackers to trick users of unpatched Outlook into opening files to steal Windows credentials.
Attackers can later use the compromised user’s authentication to gain access to sensitive data or spread throughout the network.
