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CVE-2026-18263— Parallels RAS Client RDP Backend Service Exposed Dangerous Function Local Privilege Escalation Vulnerability

Quick assessment

Affected
Parallels RAS Client
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Parallels RAS 客户端 RDP 后端服务暴露危险函数导致本地权限提升漏洞。此漏洞允许本地攻击者在受影响的 Parallels RAS 客户端安装上提升权限。攻击者首先需要获得在目标系统上执行低权限代码的能力，才能利用此漏洞。 该特定缺陷存在于 RAS RDP 后端服务中。问题源于一个被暴露的危险函数。攻击者可利用此漏洞提升权限，并以 SYSTEM 用户上下文执行任意代码。ZDI 编号为 ZDI-CAN-28886。

AI Predicted 7.8 Difficulty: Easy EPSS 0.17% · P6

Affected Version Matrix 1

VendorProduct Version RangeStatus
Parallels RAS Client 21.0.26296 affected
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I. Basic Information for CVE-2026-18263

Vulnerability Information
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Vulnerability Title
Parallels RAS Client RDP Backend Service Exposed Dangerous Function Local Privilege Escalation Vulnerability
Source: CVE Program / CVE List V5
Vulnerability 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-28886.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
暴露危险的方法或函数
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Parallels RAS Client 21.0.26296 -

II. Public POCs for CVE-2026-18263

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III. Intelligence Information for CVE-2026-18263

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Vendor Advisories for CVE-2026-18263 (1)

Same Patch Batch · Parallels · 2026-08-20 · 3 CVEs total

CVE-2026-18262 Parallels RAS Client RDP Backend Service Exposed Dangerous Function Local Privilege Escala
CVE-2026-13121 Parallels RAS Client RDP Backend Service Exposed Dangerous Function Local Privilege Escala

IV. Related Vulnerabilities

Same product: RAS Client
Same vendor: Parallels
Same weakness: CWE-749

V. Comments for CVE-2026-18263

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