Vulnerability · Published Aug 20, 2026 · Assigned by zdi

CVE-2026-13121Parallels RAS Client RDP Backend Service Exposed Dangerous Function Local Privilege Escalation Vulnerability

High 7.8

In plain English

A high-severity security flaw in RAS Client from Parallels. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities).

Severity (CVSS 3.0)7.8High

Exploit odds (30 days)0.2%top 93.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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. Was ZDI-CAN-29220.

Affected products (as reported)

Vendor	Product	Versions
Parallels	RAS Client	21.0.26296

Weakness: CWE-749 · Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

ZDI-26-554 x_research-advisory