CVE-2025-12677 is a vulnerability identified in the KiotViet Sync plugin for WordPress, specifically in the register_api_route() function located in kiotvietsync/includes/public_actions/WebHookAction.php. This flaw allows unauthenticated attackers to retrieve sensitive webhook token values when the plugin is configured, due to improper access controls on the API route. The webhook token is a critical secret used to authenticate webhook requests, and its exposure can lead to unauthorized interactions with backend systems that rely on these tokens for validation. The vulnerability affects all versions up to and including 1.8.5 of the plugin. The CVSS v3.1 base score is 5.3, reflecting a medium severity primarily due to the ease of exploitation (no authentication or user interaction required) but limited impact scope (confidentiality only). The vulnerability does not affect the integrity or availability of the system directly. No patches are currently linked, and no known exploits have been observed in the wild as of the publication date. The exposure of webhook tokens can facilitate further attacks such as unauthorized data retrieval or injection of malicious data via webhooks, depending on the backend implementation. Organizations using this plugin should be aware of the risk of token leakage and take immediate steps to mitigate exposure until an official patch is released.

For European organizations, the exposure of webhook tokens can lead to unauthorized access to backend services that rely on these tokens for authentication, potentially resulting in data leakage or manipulation of business processes integrated via webhooks. While the vulnerability does not directly compromise system integrity or availability, the confidentiality breach can be leveraged for further attacks, including impersonation of legitimate webhook calls or exfiltration of sensitive data. This is particularly critical for e-commerce and retail businesses using KiotViet Sync for inventory or order synchronization, as unauthorized webhook access could disrupt supply chain data or customer order information. The medium severity score indicates a moderate risk, but the ease of exploitation without authentication increases the urgency for mitigation. European organizations with WordPress-based e-commerce platforms integrating KiotViet Sync should consider this a significant threat vector, especially in countries with high adoption of WordPress and e-commerce solutions.

1. Immediately restrict access to the vulnerable API route by implementing IP whitelisting or authentication mechanisms at the web server or application firewall level to prevent unauthenticated access. 2. Monitor webhook token usage and logs for any unusual or unauthorized activity that could indicate exploitation attempts. 3. Disable the KiotViet Sync plugin temporarily if webhook functionality is not critical until a patch is available. 4. Follow the vendor’s updates closely and apply patches as soon as they are released. 5. Conduct a thorough audit of all webhook integrations to ensure tokens are not exposed elsewhere and rotate webhook tokens if possible to invalidate any potentially leaked credentials. 6. Employ network segmentation and least privilege principles to limit the impact of any compromised webhook tokens. 7. Educate development and operations teams about secure API route configuration and the risks of exposing sensitive tokens in publicly accessible endpoints.