Training Data Poisoning 2026 — How Attackers Corrupt AI Models Before Deployment

📰 Originally published on SecurityElites — the canonical, fully-updated version of this article. Training data poisoning in 2026 :— The AI security attack class that operates before deployment, corrupting the model at the source before any user touches it. Every AI model learns from data. If an attacker can influence what data the model trains on, they can influence what the model learns — including hidden behaviours that activate only under specific conditions, invisible to standard evaluation