CVE-2025-62979 is a security vulnerability identified in the ACF to REST API plugin developed by airesvsg, affecting all versions up to and including 3.3.4. The vulnerability involves the insertion of sensitive information into data sent via the REST API, enabling attackers to retrieve embedded sensitive data that should otherwise be protected. This issue arises from improper handling or filtering of sensitive fields within the plugin's API responses, potentially exposing confidential information such as credentials, personal data, or configuration details. The vulnerability does not require authentication or user interaction, making it easier for attackers to exploit remotely. Although no known exploits have been reported in the wild, the risk remains significant given the plugin's widespread use in WordPress environments for extending REST API capabilities. The lack of an official patch at the time of disclosure means organizations must rely on interim mitigations. The vulnerability primarily impacts confidentiality, with potential secondary effects on integrity if sensitive configuration data is exposed and manipulated. The absence of a CVSS score necessitates a severity assessment based on the vulnerability's characteristics, which indicate a high severity due to ease of exploitation and sensitive data exposure. The plugin is commonly used in content management and web application contexts, making it a valuable target for attackers seeking to access sensitive backend data through API endpoints.

For European organizations, the exposure of sensitive information through the ACF to REST API plugin can lead to significant data breaches, regulatory non-compliance (e.g., GDPR violations), and reputational damage. Organizations handling personal data, financial information, or intellectual property are particularly at risk. The vulnerability could allow attackers to access confidential data without authentication, potentially enabling further attacks such as identity theft, fraud, or lateral movement within networks. This risk is amplified in sectors with stringent data protection requirements like finance, healthcare, and government. Additionally, the exposure of sensitive configuration or credential data could facilitate subsequent compromise of web infrastructure. The impact extends beyond data confidentiality to potential operational disruptions if attackers leverage exposed information to manipulate or disrupt services. European entities relying on WordPress sites with this plugin integrated into their digital services must consider the vulnerability a critical risk to their data security posture.

To mitigate CVE-2025-62979, organizations should immediately audit their WordPress installations to identify the presence and version of the ACF to REST API plugin. Until an official patch is released, restrict REST API access by implementing strict authentication and authorization controls, such as limiting API access to trusted IP addresses or authenticated users only. Employ Web Application Firewalls (WAFs) to detect and block suspicious API requests that attempt to retrieve sensitive data. Review and sanitize all data exposed via the REST API endpoints to ensure sensitive fields are not inadvertently included. Monitor logs for unusual API access patterns indicative of exploitation attempts. Consider disabling the plugin temporarily if it is not essential or replacing it with alternative solutions that do not expose sensitive data. Stay informed about vendor updates and apply patches promptly once available. Additionally, conduct regular security assessments and penetration tests focusing on API security to detect similar vulnerabilities proactively.