Security Advisory

CVE-2026-56843

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-07-08 00:15:43

Last updated 2026-07-08 13:04:17

Assigner hackerone

CVSS score 9.9

State PUBLISHED

Description

Incorrect authorization in the XML-RPC API of WebPros Plesk before 18.0.78.4 allows a low-privileged authenticated customer to look up domains they do not own, because ownership is enforced only for certain lookup filters and schema validation is bypassed for legacy protocol versions. This results in cross-tenant disclosure of other tenants' FTP credentials stored in cleartext, which can be leveraged to execute code as another tenant's system user.

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