ZDI-26-556: Parallels RAS Client RDP Backend Service Exposed Dangerous Function Local Privilege Escalation Vulnerability
ZDI discloses Parallels RAS Client RDP backend service flaw (CVE-2026-18263, CVSS 7.8) letting local attackers escalate privileges.
ZDI advisory ZDI-26-556 covers an exposed dangerous function in the Parallels RAS Client's RDP backend service, tracked as CVE-2026-18263 with a CVSS rating of 7.8. A local attacker who can already execute low-privileged code on the target system can use the flaw to escalate privileges.
- Parallels RAS Client RDP backend service privilege escalation
- CVE-2026-18263 rated CVSS 7.8
- Requires attacker to already have low-privileged code execution
Vulnerabilities mentioned
All| CVE | Vulnerability | CVSS | EPSS | Signals | Published |
|---|---|---|---|---|---|
| CVE-2026-18263 | Local Privilege Escalation to SYSTEM in Parallels RAS Client RDP Backend Service | 7.8 | <1% |
From the original article
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.
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