Advisory2026-08_VDE-2026-056

CODESYS Control - Incorrect Authorization

The CODESYS Control runtime system provides a user management mechanism with multiple privilege groups including the visualization administrators group, which is intended solely to manage visualization users. Due to insufficient authorization checks an authenticated remote user with low-privileged visualization administrator access can delete higher-privileged accounts. However, independent mechanisms protect the deletion of the last remaining device admin user, preventing a complete loss of administrative access to the device. The CODESYS Control runtime system is only affected if the optional visualization user management feature is enabled and a visualization administrator account has been configured.