CVE-2026-63563 in MFPs
Summary
by MITRE • 08/03/2026
Sharp and Toshiba Tec MFPs (multifunction printers) for a certain market have been shipped with the user authentication feature disabled in the initial configuration. When used with the initial configuration, the address book editing and a range of features related to Document Filing can be accessed without user authentication. Products intended for the Japanese market are not affected.
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Analysis
by VulDB Data Team • 08/03/2026
This vulnerability represents a critical security misconfiguration affecting specific Sharp and Toshiba Tec multifunction printer models targeted at certain international markets. The flaw stems from an insecure default configuration where user authentication mechanisms are entirely disabled during the initial setup process, creating a persistent security weakness that affects multiple core functionalities within the device's interface. When these devices operate under their default settings, unauthorized individuals can exploit the lack of authentication to access sensitive administrative functions including address book editing capabilities and document filing operations without requiring any credentials or authorization.
The technical nature of this vulnerability aligns with CWE-668, which describes "Exposure of Resource to Wrong Sphere" where a resource is made available to entities that should not have access to it. This misconfiguration creates an attack surface that directly violates the principle of least privilege and fails to implement proper access controls as mandated by security best practices. The vulnerability specifically impacts devices configured without user authentication, allowing any individual with physical or network access to manipulate address book entries and utilize document filing features that would normally require authorized administrative credentials.
The operational impact of this vulnerability extends beyond simple unauthorized access to encompass potential data integrity compromises and information disclosure risks. Attackers who gain access through this misconfiguration can modify address books containing contact information, potentially including sensitive business contacts or personal data, while also being able to manipulate document filing operations that may involve confidential business documents or records. This creates opportunities for data manipulation, social engineering attacks using compromised contact information, and potential audit trail corruption within the device's logging mechanisms.
From an adversarial perspective, this vulnerability maps directly to ATT&CK technique T1210, "Exploitation of Remote Services," as it provides unauthorized access to networked printer services without requiring authentication. The affected devices represent a low-hanging fruit target for attackers seeking persistent access points within corporate networks, particularly in environments where multifunction printers are not properly secured or monitored. Organizations should implement immediate remediation measures including enabling user authentication for all administrative functions, reviewing and updating default configurations, and conducting comprehensive network security assessments to identify other potentially affected devices.
The vulnerability highlights the importance of secure configuration management practices and proper device hardening procedures as outlined in NIST SP 800-125 and ISO/IEC 27001 standards. Effective mitigations include enforcing mandatory authentication for all administrative functions, implementing regular security audits to verify device configurations, establishing clear policies for initial device setup and ongoing maintenance, and ensuring that default credentials are changed immediately upon deployment. Organizations should also consider network segmentation strategies to limit access to printer services and implement monitoring solutions to detect unauthorized access attempts to these devices.
Security professionals must recognize this as a configuration-based vulnerability that can be remediated through proper administrative procedures rather than requiring software patches or firmware updates. The solution involves implementing robust configuration management processes that ensure all devices are properly secured during initial deployment, including enabling authentication mechanisms, setting strong default passwords where applicable, and establishing clear protocols for device maintenance and security updates. Regular security awareness training for IT personnel regarding secure device configuration practices is essential to prevent similar vulnerabilities from occurring in other networked equipment.