Anthropic's Mythos AI Model Finds a Critical Authentication Flaw in the Rejetto HTTP File Server

My take: An Anthropic AI model called Mythos found a critical flaw in a program thousands of businesses use to share files, the Rejetto HTTP File Server. The model spotted that the way the program generated its session keys was predictable, and that a separate part of the system was leaking exactly the data needed to reconstruct that key. Put those two pieces together, and you can fully forge an admin session.

What really matters here isn't just the discovery, it's the speed: according to security reports, attempts to exploit that same flaw showed up within a day of it becoming public. That tells us something important about the moment we're in: AI is now finding security flaws faster than many companies can patch their systems.

For any business running third party software, this isn't just an IT department issue. If your company depends on internet connected tools, the question is no longer whether a flaw will eventually show up, it's how fast you actually have a process to update your systems once a patch is out.

Does your business have a clear plan today to apply security updates within hours, not weeks?