Improper Authorization in Plesk XML API Leading to Privilege Escalation

Executive Summary

CVE-2026-48614 is an improper authorization vulnerability in the Plesk XML API that allows an authenticated user to inject arbitrary configuration directives.

This injection leads to arbitrary file write operations as the root user and results in full privilege escalation on the underlying server.

The vulnerability affects Plesk XML API versions below 18.0.30 and was responsibly disclosed by Georgii Shutiaev.

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Impact Analysis

This vulnerability can have severe impacts as it allows an authenticated user to gain root-level access on the server.

With full privilege escalation, an attacker can write arbitrary files as root, potentially leading to complete system compromise, unauthorized data access, and disruption of services.

If exploited, it could allow attackers to control the server environment, install malicious software, or steal sensitive information.

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Mitigation Strategies

To mitigate the vulnerability CVE-2026-48614 in Plesk's XML API, users should install the latest Plesk updates, specifically version 18.0.30 or later, where the issue is fixed.

If updating is not possible immediately, users should disable the Plesk XML API or restrict access to it as a temporary mitigation measure.

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