Post by Expel

Anthropic Mythos didn't create new vulnerabilities. It just made the old ones much easier to find. Think of it like this: there's an old safe hidden behind a painting. It has known weaknesses, but nobody's cracked it in decades—not because it's uncrackable, but because it's unfindable. Now give every attacker a tool that locates any vulnerable safe in seconds. The safe didn't get weaker. What changed was the cost of finding it. That's the shift Mythos represents. Work that used to require expert researcher time now takes a prompt and cheap tokens. Every organization running legacy code, open source dependencies, or software that hasn't been reviewed carefully is doing the math differently now. Here's the part of this story that gets less attention: defenders actually have an edge. For closed source software, attackers are working from compiled binaries. Defenders who own the source code can point an LLM at it directly and find vulnerabilities before attackers can work backwards to them. Most organizations aren't doing this yet. The fundamentals still matter, too. Segmentation, least privilege, phishing-resistant MFA—these don't prevent exploitation, but they determine how bad it gets when it happens. And in a world where exploitation is increasingly hard to prevent, containment is where the real security work lives. James Shank, Expel's Director of Threat Operations and official reviewer on the Cloud Security Alliance's Mythos-ready security program paper, gave us his unfiltered take. This is part one. https://lnkd.in/e-prP_RN #Cybersecurity #MDR #ThreatIntel #AI