CVE-2026-93026 in Backup and Replication
Summary
by MITRE • 10/07/2026
This vulnerability in Veeam Backup & Replication allows a Backup Viewer to modify the Enterprise Manager master key and stored antivirus update credentials.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 10/07/2026
The identified security flaw within Veeam Backup & Replication represents a critical authorization bypass that undermines the integrity of sensitive configuration data managed by the enterprise infrastructure. Specifically, this vulnerability affects the interaction between the Backup Viewer role and the Enterprise Manager component, allowing an authenticated user with backup viewing privileges to perform administrative-level modifications. The core technical issue lies in insufficient access control checks within the API endpoints or internal logic governing the management of encryption keys and credential stores. By exploiting this flaw, a malicious actor can alter the master key used for encrypting sensitive data stored by Veeam solutions, as well as modify credentials associated with antivirus update mechanisms. This capability effectively grants low-privilege users the ability to escalate their privileges or disrupt critical security controls without requiring explicit administrative rights.
From a technical perspective, this vulnerability is classified under CWE-269 Improper Privilege Control and CWE-354 Improper Validation of Integrity Check Value if it involves tampering with cryptographic parameters that ensure data authenticity. The attack vector typically requires the attacker to have valid credentials for a Backup Viewer account, which are often more widely distributed than administrative accounts due to their lower perceived risk. Once authenticated, the attacker can send crafted requests to the Enterprise Manager service to overwrite the master key or update antivirus credential entries. This manipulation compromises the confidentiality and integrity of backed-up data because changing the master key may render existing backups inaccessible if not handled correctly by the system's recovery mechanisms. Furthermore, altering antivirus credentials could prevent automated security updates from executing properly, leaving backup repositories vulnerable to malware infections that might compromise the restoration process or spread through replicated environments.
The operational impact of this vulnerability is severe for organizations relying on Veeam solutions for disaster recovery and data protection strategies. If an attacker modifies the master key, they may lock out legitimate administrators from accessing encrypted backups, effectively creating a denial-of-service condition against critical business continuity assets. Alternatively, if the intent is malicious exfiltration or manipulation, changing these parameters could facilitate unauthorized access to backup repositories once new keys are established under the attacker's control. The modification of antivirus update credentials poses an indirect but significant risk by degrading the security posture of the backup infrastructure itself. Since backups often serve as the last line of defense against ransomware and other threats, ensuring that they remain uncompromised and up-to-date with current threat intelligence is paramount. An inability to receive proper antivirus updates increases the likelihood that malicious code embedded in restored data could execute undetected on target systems during recovery operations.
Mitigation strategies must focus on both immediate remediation and long-term architectural improvements. The primary defense is applying the latest security patches provided by Veeam, which address the underlying authorization logic flaws preventing unauthorized modifications to sensitive configuration objects. Organizations should also enforce strict role-based access control policies, ensuring that Backup Viewer accounts are restricted strictly to read-only operations where feasible within their specific deployment model. Implementing multi-factor authentication for all administrative interfaces adds an additional layer of protection against credential theft and subsequent exploitation attempts. Additionally, regular auditing of user activities and configuration changes can help detect unauthorized modifications early in the attack chain. Security teams should review logging mechanisms to ensure that all access events related to Enterprise Manager configurations are captured and monitored for anomalies indicative of privilege escalation attempts or integrity violations.