Second article in my MCP security series. A malicious MCP server returns a 401 with a crafted WWW-Authenticate header pointing resource_metadata at any URL it wants. The MCP SDK fetches that URL without origin validation — blind SSRF, affects both Python and TypeScript SDKs, Claude Desktop, and Claude Code. Reported to Anthropic VDP, closed as duplicate. Full technical details disclosed here.

The Hacker Recipes said remote SID History injection from Linux was impossible. Here’s how I proved them wrong — and every bug I hit along the way.

A deep dive into a protocol-level vulnerability in the Model Context Protocol (MCP) specification where malicious SVG icons delivered via data: URIs can escalate from XSS to full RCE on Electron clients. Reported to Anthropic VDP, closed as Informative — disclosed here with full technical details.

Building a cross-platform GoldenGMSA tool by reverse engineering Windows cryptographic DLLs and implementing NIST SP800-108 KDF from scratch

Complete exploitation of a Windows Active Directory machine highlighting Kerberos delegation RBCD techniques

The Phreaks 2600 team actively participated in the Hack4Values Grand Live Hacking Solidaire 2025, contributing to the security of NGOs and associations