INSPECTING ARCHIVED INTELLIGENCE (OUTDATED VERSION).

EMARKETER's FulcrumSec Hacked

| 2026-10-23 12:49 HIGH LOW DATA BREACH
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Executive Summary
AI-generated
A cyber alert has been issued regarding a breach by the FulcrumSec hacking group at EMARKETER, allegedly resulting in the exfiltration of 15.8 TB of data containing over 21.5 million files from the United States. The identified entity behind this incident is FulcrumSec, while no other organisation or individual has been attributed to the breach. This attack appears to involve the unauthorized transfer of large amounts of sensitive information, with the exact methods used by FulcrumSec remaining unclear at present. As a result, EMARKETER has likely suffered significant data breaches and security vulnerabilities, which are currently being assessed and addressed.
Technical Mitigations AI-generated
• Reset credentials and API keys that may have been exposed, and review access logs for the affected accounts or integrations.
Intelligence Metadata
Actors / Malware / CVEs / Campaigns
Target & Sectors
NORTH_AMERICA NORTH_AMERICA
Incident Timeline
‎2026/10/23
FulcrumSec hacking group claimed to have breached EMARKETER, allegedly exfiltrating 15.8 TB of data containing over 21.5 million files on October 23, 2026.
organisation FulcrumSec
US - EMARKETER FulcrumSec hacking group claims to have breached EMARKETER, allegedly exfiltrating 15.8 TB of data containing over 21.5 million files.
organisation TB
US - EMARKETER FulcrumSec hacking group claims to have breached EMARKETER, allegedly exfiltrating 15.8 TB of data containing over 21.5 million files.
data_breach 15.8 TB
US - EMARKETER FulcrumSec hacking group claims to have breached EMARKETER, allegedly exfiltrating 15.8 TB of data containing over 21.5 million files.
data_breach 21.5 files
US - EMARKETER FulcrumSec hacking group claims to have breached EMARKETER, allegedly exfiltrating 15.8 TB of data containing over 21.5 million files.
Tactical Metrics
Metrics
data_breach
16
Tb
US - EMARKETER FulcrumSec hacking group claims to have breached EMARKETER, allegedly exfiltrating 15.8 TB of data containing over 21.5 million files.
Metrics
data_breach
21,500,000
Files
US - EMARKETER FulcrumSec hacking group claims to have breached EMARKETER, allegedly exfiltrating 15.8 TB of data containing over 21.5 million files.
Intelligence Sources
Bluesky Hackmanac 2026-10-23