CVE-2025-12676 identifies a security vulnerability in the KiotViet Sync plugin for WordPress, specifically in versions up to and including 1.8.5. The root cause is the presence of a hardcoded password within the QueryControllerAdmin::authenticated function, which is used for authentication purposes. This hardcoded credential allows an attacker to bypass normal authorization mechanisms without requiring any privileges or user interaction. As a result, an unauthenticated attacker can remotely create and synchronize products within the affected WordPress environment. The vulnerability is classified under CWE-259 (Use of Hard-coded Password), a common security weakness that undermines authentication controls. The CVSS v3.1 base score is 5.3, indicating a medium severity level, with the vector AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N, meaning the attack can be performed remotely over the network with low complexity, no privileges, and no user interaction, impacting integrity but not confidentiality or availability. No patches or fixes have been released at the time of publication, and no known exploits have been observed in the wild. The vulnerability affects all versions of the plugin, making it critical for users to implement mitigations promptly. The plugin is typically used in e-commerce contexts to synchronize product data, so exploitation could lead to unauthorized product creation and data integrity issues.

The primary impact of this vulnerability is on the integrity of product data within WordPress sites using the KiotViet Sync plugin. Attackers can inject unauthorized product entries or modify existing product synchronization processes, potentially leading to fraudulent product listings, inventory inconsistencies, or disruption of business operations. Since the vulnerability does not affect confidentiality or availability, sensitive data leakage or denial of service are not direct concerns. However, the ability to manipulate product data without authentication can damage business reputation, cause financial losses, and undermine customer trust. The ease of exploitation (remote, no privileges, no user interaction) increases the risk of automated attacks or mass exploitation attempts. Organizations relying on this plugin for e-commerce synchronization are particularly vulnerable, especially if they do not have additional compensating controls such as web application firewalls or network segmentation. The lack of patches means the window of exposure remains open until mitigations are applied or updates are released.

Since no official patches or updates are currently available for this vulnerability, organizations should implement the following specific mitigations: 1) Immediately disable or uninstall the KiotViet Sync plugin if it is not critical to business operations to eliminate the attack surface. 2) Restrict network access to the WordPress administration endpoints related to the plugin using IP whitelisting or firewall rules to limit exposure to trusted sources only. 3) Employ a web application firewall (WAF) with custom rules to detect and block requests attempting to exploit the hardcoded password authentication bypass. 4) Monitor logs for unusual product creation or synchronization activities that could indicate exploitation attempts. 5) If possible, review and modify the plugin code to remove or replace the hardcoded password with a secure authentication mechanism, applying secure coding best practices. 6) Plan for rapid deployment of official patches or updates once they become available from the vendor. 7) Educate site administrators about the risks and encourage regular security audits of plugins and third-party integrations. These measures go beyond generic advice by focusing on immediate risk reduction and proactive detection tailored to this specific vulnerability.