Cal.com, which provides scheduling software, is moving its core open-source codebase to a closed repository, citing the dangers of AI hacking its open code
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Cal.com Dumps Open Source Over AI-Powered Hacking Fears
Scheduling software maker Cal.com is closing its open-source codebase, blaming AI tools that can exploit publicly visible code.
Cal.com is making a dramatic pivot. The scheduling software company is moving its core open-source codebase into a closed repository — and AI is the reason why.
The company says modern AI tools have made open-source code dangerously exposed. When your entire codebase is public, AI can analyze it for vulnerabilities at machine speed. That's a security nightmare Cal.com no longer wants to live with.
The move is described as reluctant. Cal.com built its reputation on open source and clearly isn't thrilled about walking away from it. But the calculus has changed. AI-assisted hacking has shifted the risk profile of maintaining a fully public codebase.
Notably, Cal.com emphasized this isn't about any specific threat or mythology around AI. It's a practical response to real, evolving risks posed by increasingly capable AI security exploitation tools.