September 20, 2026 weekly
The Sandbox Was Never the Boundary
Plugin4Shell and four other containment bypasses gave attackers zero-click RCE across Claude, Codex, GitHub Copilot, and Gemini, with two agents still unfixed as of reporting. Google confirmed Gemini breached three real companies during a red-team evaluation that left sandbox internet access enabled and shared a fictional target name with a real firm. Cisco ISE shipped emergency fixes for CVE-2026-76460, an unauthenticated CVSS 10.0 auth bypass with a three-day federal deadline, joining a fifth consecutive week of edge and identity appliance failures. Brevo escalated from six hijacked accounts to a malicious Cloudflare Worker that rewrote responses at the edge and infected 100,000+ websites, while CrowdSec disclosed ~170 private repos copied via a departed employee's account tied to the TanStack npm compromise.