Here’s a bold statement: Microsoft is rewriting the rules of cybersecurity by dramatically expanding its bug bounty program, and it’s a game-changer for how vulnerabilities are discovered and rewarded. But here’s where it gets controversial—this move isn’t just about Microsoft’s own code; it’s about everything that powers its services, including third-party and open-source components. Is this a brilliant strategy to strengthen security across the board, or could it overwhelm researchers and dilute the focus on critical issues? Let’s dive in.
Microsoft has announced a groundbreaking update to its bug bounty program, introducing an ‘In Scope By Default’ model that automatically includes all of its online services—from launch day onward. This means researchers no longer need to navigate product-specific scope definitions to qualify for rewards. The goal? To simplify participation, accelerate vulnerability reporting, and ensure that no critical flaw goes unrewarded, regardless of its origin. And this is the part most people miss—this expansion isn’t just about Microsoft’s proprietary code; it covers vulnerabilities in third-party libraries, dependencies, and open-source packages that underpin its cloud infrastructure.
Tom Gallagher, Vice President of Engineering at Microsoft Security Response Center, explains in a blog post (https://www.microsoft.com/en-us/msrc/blog/2025/12/in-scope-by-default) that this shift is more than administrative—it’s structural. By aligning incentives with real-world risks, Microsoft aims to reduce confusion and focus researchers on vulnerabilities with meaningful customer impact. For instance, if a flaw in an open-source library affects Microsoft’s services, the company wants to know about it—and it’s willing to pay for that knowledge. Gallagher states, ‘If no bounty award formerly exists to reward this vital work, we will offer one. This closes the gap for security research and raises the security bar for everyone who relies on this code.’
This change also gives Microsoft greater flexibility to collaborate with researchers on third-party vulnerabilities, whether by developing fixes or supporting maintainers. But here’s the kicker: while this approach promises to strengthen security, it could also lead to a surge in bounty payouts—at least initially. As Martin Jartelius, AI Product Director at Outpost24 AB, points out, ‘Microsoft will likely find itself paying out more bounties for a while, but the resulting security improvements will ultimately be a cost-efficient way to strengthen the organization’s overall security posture.’
Jartelius also highlights a common oversight in cybersecurity: the careless use of scope. ‘Attackers don’t care whether they gain access through a well-known vulnerability or a novel flaw in Microsoft components,’ he explains. By broadening its scope, Microsoft is addressing the full attack surface of its ecosystem, a move that’s been praised by security professionals.
Now, here’s a thought-provoking question: Is Microsoft’s approach the future of bug bounty programs, or does it risk spreading resources too thin? While the initial reaction from the security community has been overwhelmingly positive, some might argue that such a broad scope could dilute the focus on high-impact vulnerabilities. What do you think? Does this model set a new standard, or does it introduce unintended challenges?
As Microsoft rolls out this update, one thing is clear: millions of existing service endpoints are now automatically eligible for bounty coverage, and every new online service will fall under this umbrella from day one. It’s a bold move that underscores Microsoft’s commitment to security—but it’s also a conversation starter about the future of vulnerability disclosure. Share your thoughts in the comments below!
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