SEPTEMBER 18, 2026
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Case File

CVE-2026-56843

CRITICAL · CVSS 9.9 EPSS 0.36%

Source: NVD + CISA KEV + EPSS · Published 2026-07-08 · Last synced 2026-08-07

CyberRota Analysis

AI-Generated

The XML-RPC API in WebPros Plesk versions prior to 18.0.78.4 is vulnerable due to incorrect authorization, allowing low-privileged authenticated users to access domains they do not own. This flaw can lead to cross-tenant disclosure of FTP credentials stored in cleartext, enabling potential code execution as another tenant's system user. Organizations using affected versions should prioritize patching to mitigate the risk of unauthorized access and potential exploitation.

CVE
CVE-2026-56843
Severity
CRITICAL
CVSS
9.9
EPSS
0.36%

Original NVD 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.