Unauthorized Access to Japan's Government Solution Service (GSS) Exposes 246,000 Personal Records via VPN Flaw

Japan's Digital Agency confirmed that its Government Solution Service (GSS) suffered unauthorized access after attackers exploited a vulnerability in VPN equipment used for external maintenance operations. The intrusion, believed to have begun in late May 2026, allowed threat actors to compromise maintenance accounts and access large volumes of files on internal servers. On June 25, 2026, security teams detected suspicious access to numerous files using a compromised account, prompting an investigation that concluded on July 9 with confirmation of the breach. Some files containing personal information may have been exfiltrated, affecting approximately 246,000 records of government officials, civil servants, contractors, and related individuals. The agency immediately disabled the affected accounts and severed external communications on July 9 but has not disclosed technical details of the exploited VPN vulnerability. The incident was reported by Security NEXT on September 11, 2026.

Security NEXTSeptember 11, 2026Translated from Japanese

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Japan's Digital Agency has disclosed that its Government Solution Service (GSS) was compromised through unauthorized access that exploited a vulnerability in VPN equipment used for remote maintenance.

Attackers gained entry by targeting the VPN device employed for external support operations, leading to the compromise of maintenance accounts. Evidence indicates the intrusion began around late May 2026.

On June 25, 2026, monitoring systems detected unusual activity when a compromised account accessed a large number of files stored on GSS servers. Subsequent investigation with external partners confirmed the breach on July 9.

Some files may have been exfiltrated, potentially exposing 246,000 personal records. These include approximately 189,000 entries related to staff from related agencies and civil servants, plus 57,000 records concerning businesses and individuals involved in associated operations. The data encompasses names, email addresses, telephone numbers, and residential addresses collected during official duties.

The agency responded on July 9 by disabling the compromised accounts and blocking all external communications. Specific details about the VPN vulnerability remain undisclosed.

Security NEXT GSS Digital Agency

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