How a single unpatched vulnerability opened lawmakers to espionage, phishing, and national security risks.
Canada’s House of Commons suffered a data breach after attackers exploited a Microsoft SharePoint vulnerability (CVE-2025-53770, CVE-2025-53786). Personal and device information of lawmakers and staff—including emails, job titles, and device details—was exposed, raising risks of phishing, impersonation, and national security threats. The Canadian Communications Security Establishment is investigating, but attribution remains unclear, with Chinese state-linked hackers suspected. The breach is part of a wider wave of Microsoft exploits affecting U.S. and Canadian agencies, airlines, and utilities. Experts warn urgent patching, zero-trust models, and stronger cyber resilience are essential as Canada faces escalating cyberattacks targeting critical infrastructure.
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