CVE-2026-28715 is a vulnerability identified in Acronis Cyber Protect 17, a widely used backup and cybersecurity solution for both Linux and Windows platforms. The root cause is improper authorization checks (CWE-863), which means the software fails to adequately verify whether a user or process has the necessary permissions before granting access to sensitive information. This flaw can be exploited remotely over the network without requiring user interaction, but it does require the attacker to have low-level privileges (PR:L), such as a limited user account or compromised credentials with restricted access. The vulnerability specifically impacts confidentiality, allowing unauthorized disclosure of sensitive data, but does not affect the integrity or availability of the system. The CVSS v3.0 base score is 6.5, reflecting a medium severity rating, with the vector indicating network attack vector (AV:N), low attack complexity (AC:L), privileges required (PR:L), no user interaction (UI:N), unchanged scope (S:U), high confidentiality impact (C:H), and no impact on integrity or availability (I:N/A:N). No public exploits or active exploitation have been reported to date. The affected versions include all builds of Acronis Cyber Protect 17 prior to build 41186, though exact affected versions are unspecified. This vulnerability is critical for organizations relying on Acronis Cyber Protect for data protection and cybersecurity, as unauthorized access to sensitive information could lead to data leaks, compliance violations, and potential further attacks.

The primary impact of CVE-2026-28715 is the unauthorized disclosure of sensitive information, which can compromise confidentiality and potentially expose critical data such as backup configurations, credentials, or protected files. For organizations, this can lead to data breaches, regulatory non-compliance (e.g., GDPR, HIPAA), reputational damage, and increased risk of follow-on attacks leveraging leaked information. Since the vulnerability requires low privileges but no user interaction, attackers who gain limited access to the network or systems can escalate their information access without raising immediate suspicion. The lack of impact on integrity and availability reduces the risk of system disruption but does not diminish the seriousness of data exposure. Enterprises using Acronis Cyber Protect 17 in environments with sensitive or regulated data are particularly at risk. Additionally, the vulnerability could be leveraged in targeted attacks against critical infrastructure or high-value organizations that rely on this product for backup and cybersecurity management.

Organizations should immediately verify their Acronis Cyber Protect 17 build version and plan to upgrade to build 41186 or later once patches are released by the vendor. Until patches are available, implement strict network segmentation and access controls to limit exposure of Acronis management interfaces and services to trusted administrators only. Enforce the principle of least privilege rigorously to reduce the risk posed by compromised low-privilege accounts. Monitor logs and network traffic for unusual access patterns or attempts to access sensitive data through Acronis components. Consider deploying additional endpoint detection and response (EDR) tools to detect anomalous behavior related to Acronis processes. Regularly audit user permissions and review backup configurations to ensure no unauthorized changes have been made. Engage with Acronis support for any available workarounds or mitigations and stay informed on updates regarding exploit availability. Finally, incorporate this vulnerability into incident response plans to ensure rapid containment if exploitation is suspected.