INSPECTING ARCHIVED INTELLIGENCE (OUTDATED VERSION).

Belgium's tax agency confirms cyberattack, pulls services offline immediately

| 2026-10-29 14:47 HIGH LOW DATA BREACH
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Executive Summary
AI-generated
Belgium's tax agency, FOD Financiën, confirmed a cyberattack on its main online tax portal, MyMinfin, as well as other digital services, which were pulled offline to initiate initial investigations. The attack occurred on October 29 and resulted in the extension of this week's tax deadlines to November due to the temporary unavailability of affected services. Officials stated that data protection is a top priority and there are currently no indications of a data breach or compromised data. The agency confirmed that the attack was thwarted within hours, with elements potentially infected being isolated, but noted that restoring services requires considerable time and caution to rule out new risks.
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
BENELUX BENELUX
Incident Timeline
‎2026/10/29
FOD Financiën's digital services, including MyMinfin and Biztax, were temporarily pulled offline following a confirmed cyberattack.
organisation FOD Financiën
FOD Financiën confirmed the attack on Wednesday, saying that MyMinfin, the agency's main online tax portal, as well as other online services, are temporarily unavailable while they start the initial investigations.
organisation the FOD Financiën
"Data protection is a top priority for the FOD Financiën," it said.
organisation MyMinfin
As a result, MyMinfin, Tax-on-web, and Biztax went offline, but the hacking was successfully stopped.
organisation Biztax
As a result, MyMinfin, Tax-on-web, and Biztax went offline, but the hacking was successfully stopped.
‎October 31
Threat actors successfully launched a cyberattack on FOD Financiën, prompting the Belgian tax agency to pull its services offline and affecting an extended October 31 deadline for certain tax filings.
‎November 16
Threat actors successfully launched a cyberattack against Belgium's tax agency, causing the agency to pull its services offline.
Intelligence Sources
The Register - CSO 2026-10-29