CVE-2026-67394

Severity: critical (CVSS 9.0 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-01 · updated 2026-09-03
Weakness: CWE-78

Description

A critical local privilege escalation via OS command injection vulnerability has been discovered in Plesk for Linux, affecting all versions from 18.0.34 before 18.0.79.9 and 18.0.80.5. The vulnerability allows a customer or reseller with shell access (or allowed to change their own shell access) to elevate privileges to the root account on the hosting server.

Affected products

WebPros Plesk: from 18.0.34 before 18.0.79.9; from 18.0.80 before 18.0.80.5 — fixed in 18.0.79.9, 18.0.80.5

How to fix

Upgrade to a fixed version: WebPros Plesk 18.0.79.9, 18.0.80.5. Check the vendor advisory for mitigations.

References

https://support.plesk.com/hc/en-us/articles/42968165026967-CVE-2026-67394-Vulnerability-in-Plesk-allows-privilege-escalation-to-root

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