Critical CVE-2026-4769 Vulnerability in WAGO Devices Exposes Systems to Remote Attacks

CVE-2026-4769 impacts certain WAGO System I/O Field devices by activating an undocumented diagnostic interface during startup that is briefly accessible without authentication, potentially enabling remote attackers to access internal processes and achieve full system compromise. The issue carries a CVSS base score of 9.8, with no public proof-of-concept or known exploitation and no patch currently available; organizations are advised to monitor startup network access and secure affected devices or deployment environments.