CVE-2026-1833 is a vulnerability identified in the WaMate Confirm – Order Confirmation plugin for WordPress, affecting all versions up to and including 2.0.1. The root cause is a missing authorization check (CWE-862), where the plugin fails to verify that a user has the appropriate permissions before allowing certain actions. Specifically, authenticated users with subscriber-level privileges or higher can block or unblock phone numbers, operations that should be restricted to administrators only. This flaw allows unauthorized users to modify the integrity of the system by changing phone number statuses without proper authorization. The vulnerability can be exploited remotely over the network without requiring additional user interaction, making it relatively easy to exploit once an attacker has authenticated access. The CVSS v3.1 base score is 5.3, reflecting a medium severity level, with an attack vector of network, low attack complexity, no privileges required beyond subscriber-level, no user interaction, and impact limited to integrity. There are currently no known exploits in the wild, and no patches have been linked yet. The vulnerability could be leveraged to disrupt communication workflows or facilitate further attacks by manipulating phone number blocking mechanisms. Since the plugin is used in WordPress environments, the threat primarily targets websites using this plugin for order confirmation processes involving phone number management.

For European organizations, this vulnerability poses a risk primarily to the integrity of their communication management systems integrated via the WaMate Confirm plugin. Unauthorized blocking or unblocking of phone numbers could disrupt customer communications, order confirmations, or fraud prevention mechanisms, potentially leading to operational inefficiencies or customer dissatisfaction. While confidentiality and availability are not directly impacted, the integrity compromise could be leveraged by attackers to bypass security controls or facilitate social engineering attacks. Organizations relying on this plugin for critical communication workflows may face increased risk of abuse or operational disruption. The impact is particularly relevant for e-commerce, retail, and service sectors where phone-based order confirmations are integral. Additionally, unauthorized changes could complicate incident response and auditing processes, increasing the risk of undetected malicious activity.

Organizations should immediately audit their WordPress installations to identify the presence of the WaMate Confirm – Order Confirmation plugin and its version. Until an official patch is released, restrict access to the plugin’s functionalities by limiting subscriber-level permissions or higher to trusted users only. Implement strict role-based access controls (RBAC) to ensure that only administrators can perform sensitive actions like blocking or unblocking phone numbers. Monitor logs and user activities related to phone number management for unusual or unauthorized changes. Consider deploying web application firewalls (WAFs) with custom rules to detect and block unauthorized attempts to invoke these plugin functions. Regularly check for updates from the plugin vendor and apply patches promptly once available. Additionally, educate users about the risks of privilege misuse and enforce strong authentication mechanisms to reduce the risk of compromised subscriber accounts being exploited.