CVE-2026-73616 in OpenRemote
Summary
by MITRE • 08/13/2026
OpenRemote notification deletion endpoints fail to enforce realm boundaries, allowing any realm administrator to delete notifications belonging to other realms. Attackers with write:admin role in one realm can send DELETE requests to remove notifications from the master realm or other tenants without authorization checks.
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Analysis
by VulDB Data Team • 08/13/2026
This vulnerability represents a critical access control flaw in the OpenRemote notification system where realm boundaries are not properly enforced during deletion operations. The technical implementation fails to validate whether the requesting administrator has proper authorization to delete notifications from the target realm, creating a cross-realm privilege escalation vector that violates fundamental security principles of multi-tenancy and isolation.
The flaw manifests specifically in the notification deletion endpoints which lack proper realm validation checks before processing DELETE requests. When an attacker with write:admin role in one realm sends a deletion request, the system accepts the operation without verifying that the target notification belongs to the same realm as the authenticated administrator. This architectural oversight allows for unauthorized cross-tenant data manipulation and represents a classic case of insufficient authorization checking that maps directly to CWE-285 Permission Issues.
The operational impact of this vulnerability extends beyond simple data deletion as it enables attackers to disrupt communication flows between different tenant environments, potentially causing service degradation or complete loss of notification functionality for other realms. An attacker could systematically delete notifications from the master realm or other tenants, leading to critical operational failures in monitoring and alerting systems that organizations rely upon for security incident response and system maintenance.
This vulnerability aligns with several ATT&CK techniques including privilege escalation through unauthorized access and defense evasion by removing evidence of malicious activity. The attack pattern follows a typical lateral movement approach where an initial foothold in one realm allows the adversary to target resources in other realms, potentially expanding their influence across the entire platform infrastructure. Organizations using OpenRemote systems face significant risk of data integrity compromise and potential service disruption.
The recommended mitigations include implementing strict realm boundary validation for all notification deletion operations, enforcing proper access control lists that verify both authentication and authorization contexts before processing deletion requests, and establishing comprehensive audit logging to detect unauthorized cross-realm activities. Additionally, organizations should implement role-based access controls that ensure administrators can only manage resources within their designated realm boundaries, preventing the scenario where a single compromised account could affect multiple tenant environments simultaneously.
Security teams should also consider implementing automated monitoring for unusual deletion patterns across realms and establish incident response procedures specifically designed to handle cross-tenant privilege escalation attempts. The fix requires modifications to the authentication middleware to validate realm membership during deletion operations and potentially restructure the notification storage model to enforce stronger isolation between different tenant contexts. This vulnerability underscores the critical importance of proper boundary enforcement in multi-tenant architectures where failure to implement appropriate access controls can lead to cascading security incidents affecting multiple organizations within the same platform instance.