On April 7, 2026, Anthropic announced that its new Claude Mythos Preview model had discovered thousands of critical vulnerabilities in the world’s most widely used software — Windows, macOS, Linux, Chrome, and Firefox — some of them dormant for 27 years. For SMB cybersecurity in Quebec, this is not a gradual escalation of the threat: it is a fundamental change in kind. What once required weeks of work from a qualified expert can now be carried out autonomously, for a few dozen dollars, with no technical expertise required. The implicit barrier that protected SMBs — their perceived low value relative to the cost of a targeted attack — is disappearing. For Quebec SMBs, often without a dedicated security team and with a software environment that is difficult to keep up to date, the urgency to act has never been more real.