Bangkok Metropolitan Administration Systems Malicious Activity Detected
The National Cybersecurity Center detected malicious activity in the systems of two government agencies, including the Bangkok Metropolitan Administration (BMA), between May 21st and 22nd, 2026. The nature and impact of the incident, as well as the data compromised, are currently under investigation.
Signal context
First seen: May 21, 2026
Last updated: Jun 29, 2026
Status: Public signal
Key points
- Malicious activity detected in government agency systems.
- Detection occurred between May 21st and 22nd, 2026.
- Nature and impact of the incident are under investigation.
Signal analysis
BetaThis analysis groups the signal by industry, likely incident action and impacted security area. It helps compare this signal with other published signals without treating the labels as final determinations.
Sector: Public Administration
Likely country: Location not provided
Watch internet-facing systems, credential abuse and exploit activity.
- Source type: outside the affected organization
Impact area: Confidentiality
- 2 signals in the same sector
- 90 signals with the same likely impact area
- 1 signal linked to this organization/domain
External sources
May 2026 Data Breaches: List Major Incidents & Latest Updates - SharkStrikerhttps://sharkstriker.com/blog/may-2026-data-breaches/Public source from sharkstriker.com.
Biggest Cyber Attacks, Data Breaches, Ransomware Attacks of May 2026https://www.cybersecurity-insiders.com/biggest-cyber-attacks-data-breaches-ransomware-attacks-of-may-2026/Public source from cybersecurity-insiders.com.
Related signals
Grouped by why the signal is relevant.
Tchap (French government messaging service) data breach
A user account on Tchap, the French government's encrypted instant messaging service, was compromised due to account usurpation. The National Agency for the Security of Information Systems (Anssi) detected the compromise on June 7, 2026. The Interministerial Digital Directorate (Dinum) confirmed the incident and immediately blocked the malicious account. Potentially exposed data includes names, email addresses, affiliated entities, and avatars for at least 73,467 public agents. Private, end-to-end encrypted conversations were not affected, but content from public, unencrypted channels may have been accessed.
French Government Messaging Service Tchap Compromised
An incident on June 7, 2026, saw a user account on Tchap, the French government's encrypted instant messaging service, compromised. This led to unauthorized access and exfiltration of data from public, unencrypted chat rooms. Private, end-to-end encrypted conversations were not affected. The incident was detected by ANSSI and confirmed by DINUM, which immediately blocked the compromised account. The threat actor 'misere' claimed responsibility for the breach.
NIFTY Corporation Affected by KDDI Corporation Data Breach
NIFTY Corporation, a Japanese internet service provider, was impacted by a data breach originating from an email system provided by KDDI Corporation. Threat actors gained unauthorized access to this shared system by exploiting a vulnerability in third-party software. This led to the potential exposure of up to 14.2 million email addresses and passwords across all affected ISPs. NIFTY Corporation customers' email addresses and passwords may have been compromised.
BIGLOBE Inc. Affected by KDDI Corporation Data Breach
BIGLOBE Inc., a Japanese internet service provider, was impacted by a data breach originating from an email system provided by KDDI Corporation. Threat actors gained unauthorized access to this shared system by exploiting a vulnerability in third-party software. This led to the potential exposure of up to 14.2 million email addresses and passwords across all affected ISPs. BIGLOBE Inc. customers' email addresses and passwords may have been compromised.
STNet, Inc. Affected by KDDI Corporation Data Breach
STNet, Inc., a Japanese internet service provider, was impacted by a data breach originating from an email system provided by KDDI Corporation. Threat actors gained unauthorized access to this shared system by exploiting a vulnerability in third-party software. This led to the potential exposure of up to 14.2 million email addresses and passwords across all affected ISPs. STNet customers' email addresses and passwords may have been compromised.
KDDI Web Communications Customer Data Affected by KDDI Email System Breach
KDDI Web Communications, a subsidiary of KDDI, was impacted by the data breach in KDDI Corporation's email system, disclosed on June 28, 2026. The incident, caused by a third-party software vulnerability, led to the potential exposure of up to 14.2 million email addresses and passwords belonging to customers across six Japanese ISPs, including KDDI Web Communications.