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    CVE-2026-56843

    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.

    Published:Jul 8, 2026
    Last Modified:Aug 1, 2026
    EPS:Jul 8, 2026
    EPSS Score:0.00364
    CVSS Score:9.9

    Affected Products

    Vendor
    Webpros
    Product
    Plesk

    Exploits

    No exploit reference

    Related CVEs

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    CVE-2026-65646 (CVSS 8.7) — Improper neutralization of special elements in Plesk allows remote authenticated users to disclose arbitrary l…
    CVE-2026-65642 (CVSS 8.6) — Insecure direct object reference in Plesk 18.0.79.7 and earlier or 18.0.80 through 18.0.80.3, allows remote au…
    CVE-2026-64639 (CVSS 9.3) — Incorrect database cloning process in Plesk from 18.0.52 before 18.0.79.6 and 18.0.80.2 allows a low-privilege…
    CVE-2026-64637 (CVSS 9.9) — Improper privilege management in the XML-RPC API of Plesk before 18.0.80, allows an authenticated reseller to …
    CVE-2026-64636 (CVSS 7.7) — An SQL injection vulnerability in Plesk Obsidian up to 18.0.80 for Linux and Windows allows an authenticated u…
    CVE-2026-58046 (CVSS 9.9) — Improper neutralization in the Plesk XML-RPC API allows a remote authenticated low-privileged user to perform …
    CVE-2026-48614 (CVSS 9.9) — An improper authorization vulnerability in the Plesk XML API allows an authenticated user to inject arbitrary …

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High