CVE-2026-28716 is a vulnerability identified in Acronis Cyber Protect 17, affecting both Linux and Windows platforms prior to build 41186. The root cause is improper authorization checks (CWE-863), which means the software fails to adequately verify whether a user has the necessary permissions before allowing access to certain functions or data. This flaw enables users with limited privileges (low-level local privileges) to disclose sensitive information and manipulate data within the application environment. The CVSS v3.0 base score is 4.4, reflecting a medium severity level, with attack vector local (AV:L), low attack complexity (AC:L), low privileges required (PR:L), no user interaction (UI:N), unchanged scope (S:U), and limited impact on confidentiality (C:L) and integrity (I:L), with no impact on availability (A:N). The vulnerability does not require user interaction but does require the attacker to have some level of local access, which limits remote exploitation potential. No public exploits or active exploitation have been reported to date. The vulnerability affects all unspecified versions of Acronis Cyber Protect 17 before build 41186, and no official patches have been linked yet. The improper authorization could allow attackers to bypass intended access controls, potentially leading to unauthorized data exposure or modification within the backup and protection software environment.

The vulnerability could allow attackers with limited local privileges to gain unauthorized access to sensitive information and manipulate data within Acronis Cyber Protect 17 environments. This can undermine the confidentiality and integrity of backup and cybersecurity data, potentially affecting incident response, recovery processes, and overall data trustworthiness. Although availability is not impacted, the manipulation of backup data or configuration could lead to longer-term operational risks and complicate recovery efforts after incidents. Organizations relying heavily on Acronis Cyber Protect 17 for data protection and cybersecurity management may face increased risk of insider threats or lateral movement by attackers who have gained low-level access. The lack of remote exploitation capability reduces the risk from external attackers but does not eliminate threats from compromised internal users or attackers who have gained initial footholds on affected systems.

Organizations should monitor Acronis announcements for patches addressing CVE-2026-28716 and apply updates promptly once available. Until patches are released, restrict local access to systems running Acronis Cyber Protect 17 to trusted personnel only and enforce strict privilege separation to minimize the number of users with low-level access. Conduct thorough audits of user permissions and access logs to detect any unauthorized attempts to access or manipulate backup data. Employ host-based intrusion detection systems (HIDS) to monitor for suspicious activities related to Acronis software processes. Consider isolating critical backup servers in segmented network zones with limited user access. Additionally, implement multi-factor authentication (MFA) for administrative access where possible and maintain regular backups of backup configurations and data to enable recovery if manipulation occurs. Finally, educate staff about the risks of privilege misuse and the importance of reporting unusual system behavior.