The CVE-2026-21748 entry was reserved on January 5, 2026, by Fortinet but subsequently marked as REJECTED, indicating that the vulnerability claim was invalidated or withdrawn. There are no affected product versions, no technical details, no known exploits, and no patches associated with this CVE. The absence of a CVSS score and the REJECTED status strongly suggest that this is not a genuine vulnerability. Such entries typically occur when initial reports are found to be inaccurate or when the issue does not meet the criteria for a security vulnerability. As a result, there is no actionable technical information or risk to analyze further.

Since CVE-2026-21748 is rejected and lacks any technical or exploit information, it poses no known risk or impact to any organizations, including those in Europe. There is no evidence of confidentiality, integrity, or availability compromise associated with this entry. European organizations do not need to allocate resources to mitigate or monitor this CVE, as it does not represent a real threat.

No specific mitigation measures are necessary for CVE-2026-21748 due to its rejected status and lack of technical details. Organizations should continue to follow standard security best practices and focus on addressing verified vulnerabilities with confirmed impact. It is advisable to monitor official vulnerability databases and vendor advisories for updates on legitimate threats.