Guillaume Valadon

Guillaume Valadon

Guillaume is a Cybersecurity Researcher at GitGuardian. He holds a PhD in networking. He likes looking at data and crafting packets. He co-maintains Scapy. And he still remembers what AT+MS=V34 means!

Paris
25 posts
The Team PCP Snowball Effect: A Quantitative Analysis

The Team PCP Snowball Effect: A Quantitative Analysis

Supply chain attacks cascade through ecosystems in ways traditional metrics hardly capture. GitGuardian evaluates the PCP Team incidents and finds damage spread to thousands of public targets.

Trivy’s March Supply Chain Attack Shows Where Secret Exposure Hurts Most

Trivy’s March Supply Chain Attack Shows Where Secret Exposure Hurts Most

The Trivy story is moving quickly, and the latest reporting makes one thing clear: this is no longer just a GitHub Actions tag hijack. What started as a compromise of trivy-action, setup-trivy, and the v0.69.4 release has expanded into malicious Docker Hub images.

2,622 Valid Certificates Exposed: A Google-GitGuardian Study Maps Private Key Leaks to Real-World Risk

2,622 Valid Certificates Exposed: A Google-GitGuardian Study Maps Private Key Leaks to Real-World Risk

GitGuardian partnered with Google to answer: what happens when private keys leak? Using Certificate Transparency, we mapped about 1M leaked keys to 140k certificates. Result: 2,622 were valid as of September 2025, exposing major organizations. Our disclosure campaign achieved 97% remediation.

OpenClaw (Moltbot) Personal Assistant Goes Viral – And So Do Your Secrets

OpenClaw (Moltbot) Personal Assistant Goes Viral – And So Do Your Secrets

Early 2026, Moltbot a new AI personal assistant went viral. GitGuardian detected 200+ leaked secrets related to it, including from healthcare and fintech companies. Our contribution to Moltbot: a skill that turns secret scanning into a conversational prompt, letting users ask "is this safe?"

How Cybercriminal Organizations Weaponize Exposed Secrets

How Cybercriminal Organizations Weaponize Exposed Secrets

The threat GitGuardian has long-anticipated is now a reality: criminal groups are executing systematic attacks targeting hardcoded credentials and over-permissive IAM configurations. The situation escalated when Shiny Hunters and Crimson Collective formed an alliance to coordinate efforts.

The GhostAction Campaign: 3,325 Secrets Stolen Through Compromised GitHub Workflows

The GhostAction Campaign: 3,325 Secrets Stolen Through Compromised GitHub Workflows

On September 5, 2025, GitGuardian discovered GhostAction, a massive supply chain attack affecting 327 GitHub users across 817 repositories. Attackers injected malicious workflows that exfiltrated 3,325 secrets, including PyPI, npm, and DockerHub tokens via HTTP POST requests to a remote endpoint.