Microsoft distributed $2.3 million to security researchers who uncovered more than 80 critical vulnerabilities in its cloud and AI services during the Zero Day Quest 2026 hacking contest. The event drew nearly 700 submissions from white hat hackers across more than 20 countries, testing Microsoft's defenses under controlled conditions at its Redmond campus.
Researchers identified credential exposure risks, SSRF chains, and cross-tenant access issues that could allow attackers to move between isolated cloud environments. These findings revealed weaknesses in identity controls and tenant isolation that could impact multiple customers if combined with execution or network-level vulnerabilities.
The contest operated under strict Rules of Engagement that prevented access to real customer data while allowing system testing. Participants ranged from high school students to college professors and industry professionals, creating what Microsoft called "the largest hacking event in history" with a $5 million prize pool.
This year's payout represents a increase from the $1.6 million awarded during Zero Day Quest 2025, which received over 600 vulnerability submissions. The expanded rewards come as part of Microsoft's Secure Future Initiative launched in November 2023 following a U.S. Government report that criticized the company's security culture as "inadequate" and requiring "an overhaul."
Microsoft now pays researchers for flaws discovered in third-party components used within its services, not just Microsoft-owned code. The company plans to disclose validated vulnerabilities through the official CVE program as part of its transparency commitment.
In August 2025, Microsoft announced it had paid $17 million in bug bounties over the previous year, bringing total payouts since 2018 to more than $92 million. The latest contest results show ongoing challenges in securing complex cloud architectures where misconfigurations or chained exploits can lead to broader system compromise.
