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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Fixes

Solution

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Workaround

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History

Sat, 11 Jul 2026 20:15:00 +0000

Type Values Removed Values Added
Title Cross‑Tenant FTP Credential Exposure via Weak XML‑RPC Authorization in Plesk

Fri, 10 Jul 2026 01:15:00 +0000

Type Values Removed Values Added
Title Cross-Tenant FTP Credential Disclosure via XML-RPC API Authorization Bypass

Thu, 09 Jul 2026 04:45:00 +0000

Type Values Removed Values Added
Title Cross-Tenant FTP Credential Disclosure via XML-RPC API Authorization Bypass

Wed, 08 Jul 2026 13:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 08 Jul 2026 02:45:00 +0000

Type Values Removed Values Added
First Time appeared Webpros
Webpros plesk
Vendors & Products Webpros
Webpros plesk

Wed, 08 Jul 2026 01:00:00 +0000

Type Values Removed Values Added
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.
Weaknesses CWE-522
References
Metrics cvssV3_1

{'score': 9.9, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: hackerone

Published:

Updated: 2026-07-08T13:04:17.023Z

Reserved: 2026-06-23T15:00:03.632Z

Link: CVE-2026-56843

cve-icon Vulnrichment

Updated: 2026-07-08T13:04:13.970Z

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-07-11T20:00:08Z

Weaknesses