CVE-2026-64637 — CRITICAL (9.9)

Vulnerability Description

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.

CVSS Score

9.9

CRITICAL

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Related Weaknesses (CWE)

CWE-269

References

https://support.plesk.com/hc/en-us/articles/42432168683799

FAQ

What is CVE-2026-64637?

CVE-2026-64637 is a vulnerability with a CVSS score of 9.9 (CRITICAL). 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.

How severe is CVE-2026-64637?

CVE-2026-64637 has been rated CRITICAL with a CVSS base score of 9.9/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2026-64637?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.