CVE-2025-64229 identifies a missing authorization vulnerability in the BoldGrid Client Invoicing plugin by Sprout Invoices, affecting all versions up to and including 20.8.7. This vulnerability arises from incorrectly configured access control security levels, which fail to properly restrict user permissions within the invoicing system. As a result, unauthorized users may exploit this flaw to perform actions or access data that should be restricted, such as viewing, modifying, or deleting client invoices. The vulnerability is classified as an access control issue, which is critical in financial applications where data integrity and confidentiality are paramount. Although no public exploits have been reported yet, the nature of the vulnerability suggests that attackers with minimal privileges could escalate their access or manipulate invoicing data. The plugin is commonly used in WordPress environments to manage client invoicing, making it a target for attackers seeking financial information or aiming to disrupt business operations. The absence of a CVSS score indicates that the vulnerability has not yet been fully assessed, but the potential impact on confidentiality and integrity, combined with ease of exploitation due to missing authorization checks, indicates a serious risk. The vulnerability was published on October 29, 2025, by Patchstack, and no patches or fixes have been linked yet, emphasizing the need for proactive mitigation.

For European organizations, this vulnerability poses a significant risk to the confidentiality and integrity of financial data managed through the BoldGrid Client Invoicing plugin. Unauthorized access could lead to data leakage of sensitive client invoicing information, financial fraud, or manipulation of billing records, potentially causing financial losses and reputational damage. The availability of the invoicing system could also be indirectly affected if attackers modify or delete critical data. Sectors such as finance, retail, and services that rely heavily on invoicing software integrated with WordPress are particularly vulnerable. Given the widespread adoption of WordPress and its plugins across Europe, the impact could be broad, affecting small to medium enterprises and larger organizations alike. Furthermore, regulatory compliance risks arise, especially under GDPR, if personal or financial data is exposed due to this vulnerability. The lack of known exploits currently reduces immediate risk but does not eliminate the threat, as attackers may develop exploits once the vulnerability details are widely known.

Organizations should immediately audit their use of the BoldGrid Client Invoicing plugin to determine if they are running affected versions (up to 20.8.7). Until an official patch is released, administrators should restrict access to the invoicing system to trusted users only and review user roles and permissions to ensure the principle of least privilege is enforced. Implementing Web Application Firewalls (WAF) with custom rules to detect and block unauthorized access attempts targeting invoicing endpoints can provide temporary protection. Monitoring logs for unusual access patterns or unauthorized actions related to invoicing functions is critical. Additionally, organizations should subscribe to vendor and security advisories for timely updates and apply patches immediately once available. Conducting penetration testing focused on access control mechanisms within the invoicing plugin can help identify and remediate other potential weaknesses. Finally, educating staff about the risks and ensuring secure configuration management practices will reduce the attack surface.