CVE-2026-56843

Published Jul 8, 2026

Last updated 12 days ago

CVSS critical 9.9
FTP
Tunneling protocol

Overview

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.
Source
support@hackerone.com
NVD status
Deferred

Risk scores

CVSS 3.1

Type
Secondary
Base score
9.9
Impact score
6
Exploitability score
3.1
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Severity
CRITICAL

Weaknesses

support@hackerone.com
CWE-522

Social media

Hype score
Not currently trending