Cloudanix VulnDB

CVE-2026-56843

Critical · 9.9

CVSS

9.9

EPSS

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Published

Jul 8, 2026

CISA due date

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The record

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.

Affected packages

Ecosystem Package Introduced Fixed

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