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A critical security vulnerability, tracked as CVE-2025-66430, has been identified in Plesk for Linux, specifically affecting the Password-Protected Directories feature. This flaw allows authenticated Plesk users to inject arbitrary data into Apache configuration files, leading to local privilege escalation and enabling attackers to execute commands with root-level privileges. The vulnerability poses a severe risk of complete server compromise, data theft, malware installation, and lateral movement within affected environments. Plesk versions 18.0.70 through 18.0.74, including Plesk Onyx installations, are impacted, and security updates have been released to address the issue. Administrators are strongly advised to apply the latest micro-updates (18.0.73.5 and 18.0.74.2) immediately to mitigate the risk.
The vulnerability is the result of improper access control and insufficient input validation within the Password-Protected Directories feature. Exploitation requires access to a Plesk user account, but once achieved, attackers can escalate privileges to root, representing a significant threat to organizations relying on Plesk for server management. The issue is classified as critical, with a CVSS score of 9.1, and is remotely exploitable. Official Plesk documentation provides detailed guidance for patching affected systems, and prompt remediation is essential to prevent exploitation in the wild.
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Plesk released security updates and micro-updates to fix CVE-2025-66430, which affects Plesk for Linux versions 18.0.70 through 18.0.74 and Plesk Onyx installations. The flaw in the Password-Protected Directories feature can let a Plesk user inject Apache configuration data and execute commands with root privileges.
MITRE published CVE-2025-66430, a critical improper access control vulnerability affecting Plesk 18.0 that can allow authentication bypass and potentially root-level access. Public proof-of-concept exploit code was noted as available on GitHub, increasing exploitation risk.
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WebPros Plesk before version **18.0.80.1** is affected by **CVE-2026-64637**, an improper privilege management flaw in the **XML-RPC API** that allows an authenticated reseller to obtain an administrative session for the **root** user account. The vulnerability is classified as **CWE-269** and carries a high-severity **CVSS v3** vector of `AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H`, indicating low attack complexity and potentially severe impact on confidentiality, integrity, and availability. A related advisory from **CERT-PY** flagged the issue in Plesk products, reinforcing the risk to organizations that use the hosting control panel in multi-tenant or reseller environments. Available records indicate the flaw is not currently assessed as exploited in the wild and is not considered automatable, but its ability to let a lower-privileged authenticated user escalate directly to root-level administration makes prompt upgrading to **18.0.80.1** or later a priority.
Aug 8, 2026
Plesk disclosed and patched **CVE-2026-44962**, a critical privilege-escalation flaw in **Plesk on Linux** that allows a low-privileged authenticated user to execute arbitrary operating system commands on affected servers. The bug stems from an **XPath injection** issue in the **APS Application Catalog** search function, where unsanitized input is inserted into XPath queries, enabling remote exploitation without user interaction. The vulnerability carries a **CVSS 10.0** rating and can lead to administrative access and full compromise of server resources, with particular risk for shared hosting and other multi-tenant deployments. Plesk released fixes in versions **18.0.76.2** and **18.0.75.1**, and advised administrators to update immediately. For systems that cannot yet be patched, the company said the **APS subsystem** should be disabled through the `panel.ini` configuration file and management components restarted. The flaw was responsibly disclosed by **Georgii Shutiaev**, and reports said there was no public evidence of active exploitation at the time of publication, though defenders were urged to review access controls and monitor for suspicious command execution.
Jun 29, 2026
WebPros disclosed **CVE-2026-58046**, a blind SQL injection flaw in the **Plesk XML-RPC API** that affects all Plesk versions earlier than **18.0.79.4**. The vulnerability allows a remote authenticated user with low privileges, including customer- or reseller-level access, to query the Plesk database and read arbitrary contents. Plesk warned that exposed data can include administrator credentials, creating a path to **full server compromise**. The issue is classified as **`CWE-89`** and carries a **CVSS v3.1** vector of **`AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H`**, reflecting high impact across confidentiality, integrity, and availability. Plesk has patched the flaw in **18.0.79.4** and urged administrators to update immediately; for systems that cannot be upgraded at once, the vendor recommended mitigations in `panel.ini` to enforce strict API protocol version validation or to restrict XML API access to trusted IP addresses only. The Canadian Centre for Cyber Security also issued advisory **AV26-761**, directing organizations to apply the vendor guidance.
Jul 30, 2026