Advisory Details

December 9th, 2025

Microsoft Azure Virtual Desktop Link Following Local Privilege Escalation Vulnerability

ZDI-25-1050
ZDI-CAN-26573

CVE ID
CVSS SCORE 7.8, AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Azure Virtual Desktop
VULNERABILITY DETAILS

This vulnerability allows local attackers to escalate privileges on affected installations of Microsoft Azure Virtual Desktop. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.

The specific flaw exists within the RdAgent service. By creating a junction, an attacker can abuse the service to delete arbitrary folders and files. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of SYSTEM.

ADDITIONAL DETAILS Microsoft has issued an update to correct this vulnerability. More details can be found at:
https://portal.msrc.microsoft.com/en-us/security-guidance/researcher-acknowledgments-online-services
DISCLOSURE TIMELINE
  • 2025-08-01 - Vulnerability reported to vendor
  • 2025-12-09 - Coordinated public release of advisory
  • 2025-12-09 - Advisory Updated
CREDIT Filip Dragovic (@filip_dragovic)
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