CVE-2026-13121 Parallels CVE debrief

Who should care

Administrators and users of Parallels RAS Client installations, as well as security teams responsible for patch management and vulnerability remediation, should be aware of this vulnerability. They should prioritize patching and compensating controls to prevent local privilege escalation attacks. Additionally, operators and platform administrators should review the vendor's advisory and take necessary actions to protect their systems.

Technical summary

The vulnerability exists within the RAS RDP Backend Service of Parallels RAS Client due to an exposed dangerous function. An attacker must first execute low-privileged code to exploit this vulnerability, allowing for local privilege escalation. The issue results from an exposed dangerous function in the RAS RDP Backend Service. Defenders should prioritize patching and compensating controls. The affected product is Parallels RAS Client. This vulnerability allows local attackers to escalate privileges on affected installations of Parallels RAS Client. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of SYSTEM.

Defensive priority

Local privilege escalation vulnerability in Parallels RAS Client RDP Backend Service; defenders should prioritize patching and compensating controls.

Recommended defensive actions

• Apply patches or updates provided by the vendor to address the vulnerability
• Implement compensating controls such as monitoring for suspicious activity
• Conduct inventory checks to identify affected systems
• Restrict execution of low-privileged code on critical systems
• Review and verify the integrity of affected systems
• Track exceptions and retest remediated assets
• Close the item only after evidence is documented

Evidence notes

The vulnerability exists within the RAS RDP Backend Service due to an exposed dangerous function. An attacker must first execute low-privileged code to exploit this vulnerability, allowing for local privilege escalation. The affected product is Parallels RAS Client. Defenders should verify the presence of affected installations and review the vendor's advisory for specific patching guidance. Additionally, defenders should monitor for suspicious activity and conduct inventory checks to identify potentially affected systems.

Official resources