Microsoft pays $2.3M for cloud and AI flaws at Zero Day Quest

Microsoft Awards $2.3 Million for Cloud and AI Flaws Found in Zero Day Quest 2026

1. Overview

• On April 15, 2026, Microsoft distributed $2.3 million in rewards to security researchers after receiving nearly 700 submissions during the Zero Day Quest hacking contest.
• The live event at Microsoft’s Redmond campus surfaced more than 80 high-impact vulnerabilities tied to cloud and AI security.

1. Participant Landscape and Collaboration

• Microsoft cited broad participation from the global security research community, with contributors representing more than 20 countries.
• The mix of participants ranged from high school students to college professors, illustrating a diverse pool of talent engaging with cloud and AI security testing.

1. Testing Scope, Rules, and Findings

• Researchers conducted all testing within authorized environments in accordance with Microsoft’s Rules of Engagement.
• The testing demonstrated potential impact without accessing customer data or other tenant systems.
• Within these constraints, researchers highlighted critical paths involving credential exposure, SSRF (server-side request forgery) chains, and cross-tenant access scenarios.

1. Prize Pool Trajectory and Historical Context

• In August 2025, Microsoft announced an increase of the prize pool for Zero Day Quest, bringing total potential rewards to $5 million for that year—the largest hacking-event prize pool in history.
• The 2025 Zero Day Quest followed a prior setup in which Microsoft offered $4 million in rewards for vulnerabilities in cloud and AI products and platforms.
• After the 2025 contest concluded, Microsoft reported paying $1.6 million in rewards for vulnerability research, following more than 600 submissions.
• Earlier in the timeline, Microsoft disclosed a record $17 million in bug-bounty payments to 344 researchers across 59 countries for findings between July 2024 and June 2025.
• In December of the referenced period, Microsoft expanded its bounty program to compensate researchers for critical vulnerabilities across any of its online services, even when a third-party wrote the vulnerable code.

1. Secure Future Initiative (SFI) and Public Sharing of Findings

• Zero Day Quest is a component of Microsoft’s Secure Future Initiative (SFI), an engineering effort launched in November 2023 in response to a critical assessment of security culture.
• As part of SFI, Microsoft commits to transparently sharing critical vulnerabilities through the CVE program, even when customer action is not required.
• Leadership emphasized that learnings from Zero Day Quest would be shared across Microsoft to bolster Cloud and AI security, aligning with the core principles of securing by default, by design, and in operations.

1. Industry Perspective and Supplementary Materials

• A whitepaper accompanying the broader security program discusses automated pentesting and its limits.
• The document emphasizes that automated pentesting proves a path exists, but additional validation (BAS) is required to determine whether implemented controls can stop that path.
• The whitepaper maps six validation surfaces, highlights where automated tools may fall short, and provides diagnostic questions for evaluating security tooling.
• A promotional note invites readers to obtain the whitepaper for a deeper dive into multi-surface validation and diagnostic guidance.

1. Related Milestones and Contextual Trends

• The Zero Day Quest program is part of a broader trend in which large tech incumbents expand bug-bounty initiatives to cloud and AI ecosystems.
• Public disclosures and ongoing payouts reflect a shift toward more proactive vulnerability disclosure and a more collaborative security posture with the security research community.
• The combination of high prize pools, strict engagement rules, and large-scale participation underscores the growing importance of coordinated vulnerability disclosure in safeguarding complex, distributed online services.