Merkle staff and client data leak
Data Leak
Summary
Hide ▲
Show ▼
Merkle, the U.S.-based subsidiary of Dentsu, confirmed a data theft that exposed staff and client information and triggered notifications to impacted individuals. Internal reporting indicated that bank and payroll details, salary data, National Insurance numbers, and personal contact details may have been exposed. The event matters because certain files were taken from Merkle’s network, and the company is still determining the full scope.
Related Happenings
INC New Zealand healthcare data leak
Data Leak
First: 12.03.2026 00:00
Last: 12.03.2026 00:00
Sources 1
About this happening:
**INC** stole and later published data from a **healthcare organization in New Zealand**, exposing a large amount of information and escalating the event from intrusion to leak pu...
INC New Zealand healthcare data leak
Data LeakAbout this happening: **INC** stole and later published data from a **healthcare organization in New Zealand**, exposing a large amount of information and escalating the event from intrusion to leak pu...
AkzoNobel partial Anubis data leak
Data Leak
First: 04.03.2026 01:00
Last: 04.03.2026 01:00
Sources 1
About this happening:
**AkzoNobel** faces a **partial data leak** after **Anubis ransomware** claimed it stole **170GB of data** and **almost 170,000 files**. The leak site posted **sample screenshots*...
AkzoNobel partial Anubis data leak
Data LeakAbout this happening: **AkzoNobel** faces a **partial data leak** after **Anubis ransomware** claimed it stole **170GB of data** and **almost 170,000 files**. The leak site posted **sample screenshots*...
Sax LLP hit by network compromise
Incident
First: 29.12.2025 17:40
Last: 29.12.2025 17:40
Sources 1
About this happening:
**Sax LLP** is notifying **over 220,000 individuals** after a **cyberattack** compromised **sensitive personal data**, creating identity-theft risk from a long-undisclosed breach....
Sax LLP hit by network compromise
IncidentAbout this happening: **Sax LLP** is notifying **over 220,000 individuals** after a **cyberattack** compromised **sensitive personal data**, creating identity-theft risk from a long-undisclosed breach....
Barts Health NHS Trust invoice leak on Cl0p leak portal
Data Leak
First: 05.12.2025 20:55
Last: 05.12.2025 20:55
Sources 1
About this happening:
The **Barts Health NHS Trust** data leak became public when **Cl0p** posted stolen **invoice files** on its **dark-web leak portal**, exposing **full names and addresses** linked...
Barts Health NHS Trust invoice leak on Cl0p leak portal
Data LeakAbout this happening: The **Barts Health NHS Trust** data leak became public when **Cl0p** posted stolen **invoice files** on its **dark-web leak portal**, exposing **full names and addresses** linked...
Latest development: 08.12.2025 11:30
Barts Health NHS Trust is seeking a High Court order to stop the sharing, publication or use of invoice files stolen from its Oracle E-business Suite (EBS) database; the trust says Cl0p posted the files on the dark web, and it is working with NHS England, the National Cyber Security Centre, the Metropolitan Police and regulators including the Information Commissioner’s Office while its clinical systems remain unaffected.
Merkle hit by data theft breach
Incident
First: 29.10.2025 22:14
Last: 29.10.2025 22:14
Sources 1
How related:
Dentsu said it detected unusual activity on Merkle's network and initiated incident response protocols
About this happening:
**Merkle** suffered a **breach** that led to theft of sensitive employee files and a brief operational shutdown, exposing current and former staff to follow-on fraud risk. **Dents...
Merkle hit by data theft breach
IncidentHow related: Dentsu said it detected unusual activity on Merkle's network and initiated incident response protocols
About this happening: **Merkle** suffered a **breach** that led to theft of sensitive employee files and a brief operational shutdown, exposing current and former staff to follow-on fraud risk. **Dents...
Timeline
-
28.10.2025 23:16 2 articles · 7mo ago
Dentsu discloses Merkle cybersecurity incident
Initial DisclosureDentsu disclosed that its U.S.-based subsidiary Merkle suffered a cybersecurity incident that exposed staff and client data. The company said it detected abnormal activity in part of Merkle’s network, immediately activated incident response procedures, shut down certain systems as a precaution, reported the incident to relevant authorities in impacted countries, and began notifying impacted individuals. Internal reporting indicated that bank and payroll details, salary, National Insurance numbers, personal contact details, and information relating to some clients, suppliers, and current and former employees may have been exposed.
Show sources
- Advertising giant Dentsu reports data breach at subsidiary Merkle — www.bleepingcomputer.com — 28.10.2025 23:16
- Dentsu Subsidiary Breached, Employee Data Stolen — www.darkreading.com — 29.10.2025 22:14