Critical SEVERITY — Vulnerability

CVE-2026-64637 — Improper privilege management in the XML-RPC API of Plesk before 18.0.80, allows an authenticated reseller to obtain an

Improper privilege management in the XML-RPC API of Plesk before 18.0.80, allows an authenticated reseller to obtain an administrative session for the root user account.

Platform
Plesk
CVE Record
CVE-2026-64637
CVSS Score
9.9/10
Published
07 August 2026
Views
22
Primary source: Review the official advisory at nvd.nist.gov Go to Source

Summary

Improper privilege management in the XML-RPC API of Plesk before 18.0.80, allows an authenticated reseller to obtain an administrative session for the root user account.

Assessment

  • CVE: CVE-2026-64637
  • CVSS base score: 9.9
  • Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
  • Source: NVD record

References

Action

  • Verify affected systems against your inventory
  • Apply the vendor patch during a maintenance window
  • Restrict access at the network layer until patched

Plesk — Related Advisories

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