Insecure Default Policy and Unrestricted OIDC Enrollment in Google OSS Agent Mesh (SAM)
Classification: Critical, Solution: Official Fix, Exploit Maturity: Proof-of-Concept, CVSSv4.0: 9.3, CVEs: CVE-2026-103091, Summary: SAM's MCP proxy has no authorization. Any authenticated mesh member can invoke any tool on any node, with full read/write/exec on the backend. The only prerequisite is the control plane URL (via Shodan, I currently found a few via a header, but since this project is still in its very early adoption stage it makes sense the numbers aren't big right now, it's got…
EPSS 0.00 CVSS 9.3 CVE-2026-103091 Google FI