CVE-2026-56843CWE-522

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…

Critical · published July 8, 2026

CVSS v3.1
9.9
EPSS
1%
Percentile
50.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.9 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00655 · 50.7th percentile
Weakness
CWE-522 · Insufficiently Protected Credentials
Published
2026-07-08T00:15Z
EPSS history
Timeline
  • 08 JUL 00:15Z
    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…
    cvelistv5