CVE-2026-56843

CRITICAL

Webpros Plesk < 18.0.78.4 - Insufficiently Protected Credentials

Title source: rule

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.

References (1)

Core 1

Core References

https://support.plesk.com/hc/en-us/articles/41178305151255-Vulnerability-in-Plesk-XML-API-Cleartext-FTP-Password-Exposure

Scores

CVSS v3 9.9

EPSS 0.0036

EPSS Percentile 29.1%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact total

Details

CWE

CWE-522

Status published

Products (1)

Webpros/Plesk 10.4 - 18.0.78.4

Published Jul 08, 2026

Tracked Since Jul 08, 2026