The vulnerability stems from missing CSRF protection in the badge alignment deletion endpoint. The patch adds 'require_sesskey()' in alignment_action.php's removal handler and includes sesskey in the delete link generation in renderer.php. The core issue was the absence of a token check in the alignment deletion logic, which is implemented in the main procedural flow of alignment_action.php (not a named function). The high confidence comes from the explicit addition of sesskey checks in the commit diff for these specific code paths.