CVE-2026-56843

Summary

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.

Affected Software

VendorProductVersion RangeStatus
WebprosPlesk10.4 < 18.0.78.4affected

Weaknesses

  • CWE-522: CWE-522 Insufficiently Protected Credentials

References