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Plesk CVE-2026-68489: Code Injection

Plesk is affected by CVE-2026-68489. Static Code Injection in Plesk extensions "Ruby" before 1.6.6 and "Node.js Toolkit" before 2.5.0 allows remote authenticated users to execute arbitrary code as root via custom environment variables. Affected versions: before 1.6.6 | before 2.5.0. CVSS base score: 8.7.

Critical 8.7 CVSS
Plesk AlmaLinux 8 AlmaLinux 9 CloudLinux 8 CloudLinux 9 Debian 11 Debian 12 Ubuntu 20.04 Ubuntu 22.04

Affected Versions

before 1.6.6 | before 2.5.0

Default Update CMD

# Update the Ruby extension stack to the patched release

Fix Commands

All supported operating systems

# Update the Ruby extension stack to the patched release
# Plesk → Extensions → Updates → apply pending updates

What this means under a SharedLicense license

Your SharedLicense Plesk license itself is not affected — this is a vulnerability in Plesk, not in licensing. Licenses continue to work during and after the update; there is no need to re-issue or re-activate anything. If you resell under your own brand, patch client servers too — unpatched installs put your reputation at risk, not your license.

Static Code Injection in Plesk extensions “Ruby” before 1.6.6 and “Node.js Toolkit” before 2.5.0 allows remote authenticated users to execute arbitrary code as root via custom environment variables.

Reference: https://nvd.nist.gov/vuln/detail/CVE-2026-68489

Frequently Asked Questions

What is CVE-2026-68489?
Static Code Injection in Plesk extensions "Ruby" before 1.6.6 and "Node.js Toolkit" before 2.5.0 allows remote authenticated users to execute arbitrary code as root via custom environment variables. Affected versions: before 1.6.6 | before 2.5.0.
Is CVE-2026-68489 being exploited in the wild?
No confirmed public exploitation has been announced at the time of writing. With a CVSS base score of 8.7, apply the update on your next maintenance window and watch the vendor advisory for changes.
How do I fix CVE-2026-68489?
Update the Ruby extension stack to the patched release. Plesk → Extensions → Updates → apply pending updates.
Which versions are affected?
Affected: before 1.6.6 | before 2.5.0. Update to the latest release.

References

Security Advisories

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