CVE-2026-48584: Microsoft Azure Synapse Elevation of Privilege Vulnerability

Synopsis

An elevation-of-privilege vulnerability in Microsoft Azure Synapse allows an authenticated attacker to gain substantially higher privileges over a network connection. The flaw stems from execution with unnecessary privileges, meaning the service runs code with more access than required, and any low-privilege account is sufficient to trigger it. Successful exploitation gives an attacker full read, write, and availability impact across components beyond the directly targeted service, representing a critical cross-tenant or cross-scope privilege escalation. HarborGuard is tracking this advisory and will make a patched-image rebuild available the moment Microsoft publishes a fix version.

HarborGuard Coverage

Exploit Conditions

• Network reachabilityRequired

  The attacker must reach the Azure Synapse service over the network; there is no local or physical access requirement.

• AuthenticationRequired

  A valid account is required to exploit this vulnerability, but any low-privilege account is sufficient; no administrative credentials are needed.

• Victim interactionNot required

  No victim action such as clicking a link or opening a file is needed; the attacker can trigger the vulnerability directly.

• Attack complexityDetail

  Attack complexity is low, meaning the exploit is reliable and requires no special race conditions, memory layout knowledge, or environmental prerequisites.

Blast Radius

• A successful attacker reads confidential data from the compromised Synapse environment, including pipeline configurations, linked service credentials, and any data accessible through elevated privileges.
• The attacker writes or modifies persisted data, job definitions, and access control configurations within the service scope.
• The attacker can disrupt or crash the affected Azure Synapse service, causing availability loss for dependent data pipelines and analytics workloads.
• Because the CVSS scope is Changed, the impact extends beyond the directly attacked component, meaning adjacent systems or tenants sharing infrastructure may also be affected.