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CVE-2026-56843

Quick assessment

Affected
Webpros Plesk
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WebPros Plesk是WebPros公司的网站服务器管理平台。 WebPros Plesk 18.0.78.4之前版本存在信任管理问题漏洞，该漏洞源于XML-RPC API授权不当，可能导致低权限认证用户查询不属于自己的域名，进而导致其他租户的FTP凭据泄露，可被用来以其他租户系统用户身份执行代码。

CVSS 9.9 · Critical EPSS 0.66% · P51

Affected Version Matrix 1

VendorProduct Version RangeStatus
Webpros Plesk 10.4< 18.0.78.4 affected
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I. Basic Information for CVE-2026-56843

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不充分的凭证保护机制
Source: CVE Program / CVE List V5
Vulnerability Title
WebPros Plesk 信任管理问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WebPros Plesk是WebPros公司的网站服务器管理平台。 WebPros Plesk 18.0.78.4之前版本存在信任管理问题漏洞，该漏洞源于XML-RPC API授权不当，可能导致低权限认证用户查询不属于自己的域名，进而导致其他租户的FTP凭据泄露，可被用来以其他租户系统用户身份执行代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Webpros Plesk 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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