ZDI-26-556: Parallels RAS Client RDP Backend Service Exposed Dangerous Function Local Privilege Escalation Vulnerability
This vulnerability allows local attackers to escalate privileges on affected installations of Parallels RAS Client. 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 RAS RDP Backend Service. The issue results from an exposed dangerous function. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of SYSTEM.
Other sources
This vulnerability allows local attackers to escalate privileges on affected installations of Parallels RAS Client. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The ZDI has assigned a CVSS rating of 7.8. The following CVEs are assigned: CVE-2026-18263.
— ZDI
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Parallels RAS Clientto a version that resolves this vulnerability.Patch ZDI-26-556
Event History
Frequently Asked Questions
What is the severity of ZDI-26-556?
The severity of ZDI-26-556 is rated as 7.8 on the CVSS scale.
How do I fix ZDI-26-556?
To fix ZDI-26-556, update your Parallels RAS Client to the latest version provided by the vendor.
What type of vulnerability is ZDI-26-556?
ZDI-26-556 is a local privilege escalation vulnerability.
Who is affected by ZDI-26-556?
Any installation of Parallels RAS Client that allows local code execution is potentially affected by ZDI-26-556.
Can ZDI-26-556 be exploited remotely?
No, ZDI-26-556 can only be exploited by local attackers with access to execute low-privileged code on the affected system.