KT Corporation hit by network compromise
Incident
Summary
Hide ▲
Show ▼
The KT Corporation internal network compromise exposed subscriber data and enabled fraudulent mobile payments, affecting 16,647 subscribers and at least 368 people. The compromise persisted for nearly 11 months, from October 8, 2024 to September 5, 2025, before regulators finished their investigation. Attackers abused a lost femtocell with a valid certificate, set up a rogue device, and intercepted communications and authentication codes. The breach also triggered a KRW 53.979 billion fine and intensified scrutiny of KT's mobile network controls.
Related Happenings
PIPC fines KT Corporation for data protection violations
Regulatory/Legal Action
H score40
First: 31.07.2026 01:28
Last: 31.07.2026 01:28
Sources 1
How related:
South Korea's Personal Information Protection Commission (PIPC) has fined telecommunications giant KT Corporation KRW 53.979 billion ($39 million) over data protection violations.
About this happening:
South Korea's PIPC fined KT Corporation KRW 53.979 billion ($39 million) for data protection violations, escalating enforcement over a breach that exposed subscrib...
PIPC fines KT Corporation for data protection violations
Regulatory/Legal ActionHow related: South Korea's Personal Information Protection Commission (PIPC) has fined telecommunications giant KT Corporation KRW 53.979 billion ($39 million) over data protection violations.
About this happening: South Korea's PIPC fined KT Corporation KRW 53.979 billion ($39 million) for data protection violations, escalating enforcement over a breach that exposed subscrib...
KDDI Corporation hit by network compromise
Incident
H score92
First: 24.06.2026 15:45
Last: 24.06.2026 15:45
Sources 1
About this happening:
KDDI Corporation confirmed an email-system breach that exposed customer credentials across six Japanese ISPs, putting account access at risk. The intrusion was detecte...
KDDI Corporation hit by network compromise
IncidentAbout this happening: KDDI Corporation confirmed an email-system breach that exposed customer credentials across six Japanese ISPs, putting account access at risk. The intrusion was detecte...
Latest development: 08.07.2026 14:24
Attackers breached the KDDI email platform used by five Japanese ISPs on May 16 after exploiting a zero-day vulnerability in third-party software, exposing email addresses and passwords across the affected service providers.
Timeline
-
31.07.2026 01:28 2 articles · 2h ago
KT Corporation hit by network compromise
Initial DisclosureKT's breach first surfaced after users reported fraudulent micropayments, prompting an investigation into a suspected data exposure. Early notification on September 11, 2025 said roughly 5,500 customers had been exposed before the larger impact was confirmed.
Show sources
- South Korea fines telco giant KT $39 million for customer data breach — www.bleepingcomputer.com — 31.07.2026 01:28
- South Korea fines telco giant KT $39 million for customer data breach — www.bleepingcomputer.com — 31.07.2026 01:28