CVE-2025-66526 identifies a missing authorization vulnerability in Essekia Tablesome, a software product used for data management or tabular data processing, affecting versions up to 1.1.34. The root cause is incorrectly configured access control security levels, allowing users with limited privileges (PR:L) to perform unauthorized actions that modify data integrity (I:L) without impacting confidentiality or availability. The vulnerability can be exploited remotely (AV:N) without user interaction (UI:N), increasing its attack surface. Although no known exploits are currently reported in the wild, the flaw presents a risk of unauthorized data manipulation by low-privileged attackers. The vulnerability does not require elevated privileges beyond low-level access, indicating that internal users or attackers who have gained limited access could leverage this flaw. The lack of proper authorization checks means that security boundaries intended to restrict user actions are bypassed, potentially leading to data corruption or unauthorized changes. The CVSS score of 4.3 (medium severity) reflects the moderate impact and ease of exploitation. The absence of patches at the time of reporting necessitates immediate attention to access control policies and monitoring. Organizations should audit their Tablesome deployments for misconfigurations and prepare to apply vendor patches once released.

For European organizations, this vulnerability poses a moderate risk primarily to data integrity within systems using Essekia Tablesome. Unauthorized modifications could disrupt business processes, lead to inaccurate reporting, or corrupt critical datasets. Sectors relying heavily on data accuracy, such as finance, healthcare, and manufacturing, may experience operational disruptions or compliance issues if exploited. Since exploitation requires only low privileges and no user interaction, insider threats or attackers who have gained limited access could escalate their impact. However, the lack of confidentiality or availability impact limits the scope of damage to data tampering rather than data theft or service outages. Organizations with regulatory obligations under GDPR must consider the integrity implications and ensure proper controls to prevent unauthorized data changes. The absence of known exploits reduces immediate risk but does not eliminate the need for proactive mitigation.

1. Implement strict role-based access control (RBAC) policies within Tablesome to ensure users have only the minimum necessary privileges. 2. Conduct thorough audits of current access control configurations to identify and remediate any misconfigurations or overly permissive settings. 3. Monitor logs and user activities for unusual modification attempts or privilege escalations, focusing on low-privileged accounts performing sensitive actions. 4. Segregate duties where possible to reduce the risk of a single user performing unauthorized changes. 5. Prepare to apply vendor patches immediately upon release; maintain communication channels with Essekia for updates. 6. Employ network segmentation to limit remote access to Tablesome instances, reducing exposure to external attackers. 7. Educate internal users about the risks of privilege misuse and enforce strong authentication mechanisms to prevent unauthorized access. 8. Consider implementing application-layer firewalls or intrusion detection systems that can detect anomalous access patterns related to Tablesome.