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I want to keep everyone updated on the details of the security investigation.
The team performed an in-depth analysis to search for root causes and to better understand the behavior of the threat actor.
We cast a very wide net, pulling and processing nearly a petabyte of logs of the entire Vercel Network and API, extending well beyond the initial Context[.]ai compromise.
We now understand that the threat actor has been active beyond that startup's compromise. Threat intel points to the distribution of malware to computers in search of valuable tokens like keys to Vercel accounts and other providers.
Once the attacker gets ahold of those keys, our logs show a repeated pattern: rapid and comprehensive API usage, with a focus on enumeration of non-sensitive environment variables.
As a result:
◾We've deepened and widened our collaboration with partners across the industry, like Microsoft, AWS and Wiz, to further protect the broader internet.
◾ We've notified other suspected victims of this threat actor, independent of this event, encouraging them to rotate credentials and adopt best practices.
We've also shipped a bunch more product enhancements. I'm extremely thankful to our team and industry partners for working around the clock. For more details on the ongoing investigation, refer to our security bulletin:
https://t.co/BLVnic9fJC
Open source is dead.
That’s not a statement we ever thought we’d make.
@calcom was built on open source. It shaped our product, our community, and our growth. But the world has changed faster than our principles could keep up.
AI has fundamentally altered the security landscape. What once required time, expertise, and intent can now be automated at scale. Code is no longer just read. It is scanned, mapped, and exploited. Near zero cost.
In that world, transparency becomes exposure. Especially at scale.
After a lot of deliberation, we’ve made the decision to close the core @calcom codebase.
This is not a rejection of what open source gave us. It’s a response to what risks AI is making possible.
We’re still supporting builders, releasing the core code under a new MIT-licensed open source project called cal. diy for hobbyists and tinkerers, but our priority now is simple:
Protecting our customers and community at all costs.
This may not be the most popular call.
But we believe many companies will come to the same conclusion.
My full explanation below ↓
90 minute challenge. NO AI! NO Shortcuts! Just me and a timer.
Failed the timebox, but not the task.
Reminder to myself: Done beats perfect, and finished beats fast.
Most “estimates” are just guesses I made on a good day.
Perfection slows you down.
Finishing builds confidence.