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CVE-2026-56843

CVSS 9.9 · Critical EPSS 0.34% · P26

Affected Version Matrix 1

VendorProductVersion RangeStatus
WebprosPlesk10.4< 18.0.78.4affected
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I. Basic Information for CVE-2026-56843

Vulnerability Information
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Vulnerability Title
N/A
Source: NVD (National Vulnerability Database)
Vulnerability 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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
不充分的凭证保护机制
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
WebprosPlesk 10.4 ~ 18.0.78.4 -

II. Public POCs for CVE-2026-56843

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III. Intelligence Information for CVE-2026-56843

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Vendor Advisories for CVE-2026-56843 (1)

IV. Related Vulnerabilities

Same product: Plesk
Same vendor: Webpros
Same weakness: CWE-522

V. Comments for CVE-2026-56843

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