From package to postinstall payload: Inside the Mastra npm supply chain compromise

This collection of Microsoft Security Blog posts highlights multiple active threats and defensive advances: a Mastra npm supply‑chain compromise that delivered a hidden postinstall payload to 140+ projects (detection, hunting, and mitigation guidance); a crypto clipper campaign combining clipboard theft, wallet replacement, Tor-based C2, worm‑like propagation, persistence, and a lightweight backdoor; a prompt‑injection pathway in the Claude Code GitHub Action that could expose workflow secrets (disclosure and mitigations); and broader security topics including AI‑accelerated attacks, agentic/v