H-ISAC TLP White: Daily Cyber Headlines - October 30, 2025

Today’s Headlines:   

Leading Story

• New Phishing Attack Using Invisible Characters Hidden in Subject Line Using MIME Encoding

Data Breaches & Data Leaks 

• Advertisement and PR Giant Dentsu Says Threat Actors Stole Merkle Data
• Conduent Says Data Breach Originally Began with 2024 Intrusion

Cyber Crimes & Incidents

• Nothing to Report

Vulnerabilities & Exploits  

• CISA Warns of Dassault Systèmes Vulnerabilities Actively Exploited in Attacks

Trends & Reports

• Cyber Breaches Go Unreported as AI-Driven Threats Surge
• Nearly Half of Ransomware Victims Who Pay Ransom Cannot Recover Data

Privacy, Legal & Regulatory

• China Amends Cybersecurity Law and Incident Reporting Regime to Address AI and Infrastructure Risks

Upcoming Health-ISAC Events

• Global Monthly Threat Brief
  1. Americas - November 25, 2025, 12:00-01:00 PM ET
  2. European – November 26, 2025, 03:00-04:00 PM CET
  3. Fall Americas Summit – Carlsbad, California – December 1-5, 2025