CVE-2025-67566 identifies a missing authorization vulnerability in WofficeIO's Woffice Core product, specifically affecting versions up to and including 5.4.30. The vulnerability arises from incorrectly configured access control security levels that fail to properly restrict unauthorized access to certain functionalities or data within the application. Because the vulnerability does not require any authentication (PR:N) or user interaction (UI:N), it can be exploited remotely over the network (AV:N) by an unauthenticated attacker. The CVSS v3.1 base score of 5.3 reflects a medium severity, primarily due to its impact on confidentiality (C:L) without affecting integrity or availability (I:N, A:N). This means an attacker could potentially access sensitive information that should be protected but cannot modify or disrupt the system. Woffice Core is a collaborative platform often used for intranet and project management purposes, making the confidentiality breach a concern for organizations relying on it for internal communications and data sharing. No known exploits have been reported in the wild, and no official patches or mitigation links have been published yet. The vulnerability was publicly disclosed on December 9, 2025, by Patchstack. Organizations should prioritize reviewing their Woffice Core access control configurations to ensure proper authorization checks are in place and monitor vendor communications for forthcoming patches.

For European organizations, the primary impact of CVE-2025-67566 is the potential unauthorized disclosure of sensitive internal information managed through Woffice Core. This could include confidential project data, employee information, or strategic documents, leading to privacy violations, competitive disadvantage, or regulatory non-compliance under GDPR. While the vulnerability does not allow data modification or service disruption, the confidentiality breach alone can have significant reputational and operational consequences. Organizations in sectors such as government, finance, healthcare, and critical infrastructure that use Woffice Core for internal collaboration are at higher risk. The ease of exploitation without authentication increases the threat level, especially for externally accessible instances. However, the absence of known active exploits and the medium severity score suggest the threat is moderate but should not be ignored. Failure to address this vulnerability could invite targeted reconnaissance or data harvesting attempts by threat actors focusing on European entities.

European organizations should immediately audit their Woffice Core deployments to identify publicly accessible instances and verify access control configurations. Specific mitigation steps include: 1) Reviewing and tightening role-based access controls and permission settings within Woffice Core to ensure no unauthorized access paths exist; 2) Restricting network exposure by limiting access to Woffice Core instances via VPNs or IP whitelisting; 3) Monitoring logs for unusual access patterns or unauthorized data retrieval attempts; 4) Applying vendor patches promptly once released, as no official patch is currently available; 5) Implementing web application firewalls (WAFs) with custom rules to detect and block suspicious requests targeting access control weaknesses; 6) Educating administrators on secure configuration best practices for Woffice Core; 7) Conducting penetration testing focused on authorization bypass scenarios to validate remediation effectiveness. These measures go beyond generic advice by focusing on configuration hardening, network segmentation, and proactive detection tailored to this vulnerability's characteristics.