
Critical Fortinet2Shell Vulnerability
Vulnerability / Patch
Fortinet has warned about a critical flaw in FortiClient that lets a remote attacker run code on a user’s computer. The attacker only needs the user to visit a malicious website. The bug is tracked as CVE-2026-121529 and carries a CVSS score of 9.1. Fortinet published the advisory on November 10, 2026. The issue is an origin validation error, classified as CWE-346. Researcher Kevin Joensen from Baldur Security discovered it during internal research and humorously dubbed it “Fortinet2Shell.” He



