CVE-2026-18263
HIGHDescription
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.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Exploit Intelligence
Low risk: more likely to be exploited than 3% of all known CVEs.
References
Related Vulnerabilities
Other CWE-749 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2021-34996 | High | 8.8 | 82% | - | - |
| CVE-2010-0738 | Medium | 5.3 | 79% | KEV + Ransom | - |
| CVE-2018-10931 | Critical | 9.8 | 68% | - | Fix |
| CVE-2010-1428 | High | 7.5 | 62% | KEV + Ransom | - |
| CVE-2023-38124 | High | 8.8 | 60% | - | Fix |
| CVE-2006-1547 | High | 7.5 | 55% | KEV | Fix |
Common questions
How do I fix CVE-2026-18263?
No published fix for CVE-2026-18263 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-2026-18263 being actively exploited?
Not that we know of. CVE-2026-18263 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.13% is the estimated probability that it will be exploited in the next 30 days. That is higher than 3% of all scored CVEs.
How severe is CVE-2026-18263?
CVE-2026-18263 has a CVSS v3 base score of 7.8, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-08-26.