CVE-2026-64639

Severity: critical (CVSS 9.3 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-12 · updated 2026-10-24
Weakness: CWE-266

Description

Incorrect database cloning process in Plesk from 18.0.52 before 18.0.79.6 and 18.0.80.2 allows a low-privileged user (customer, reseller) to execute arbitrary code on behalf of the database server administrator.

Affected products

WebPros Plesk: from 18.0.52 before 18.0.79.6; from 18.0.80.0 before 18.0.80.2 — fixed in 18.0.79.6, 18.0.80.2

How to fix

Upgrade to a fixed version: WebPros Plesk 18.0.79.6, 18.0.80.2. Check the vendor advisory for mitigations.

References

https://support.plesk.com/hc/en-us/articles/42521305418903-Vulnerability-CVE-2026-64639-Privilege-Escalation-via-Database-Cloning-in-Plesk

Get alerted when CVE-2026-64639 or the next vulnerability affects your stack