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Plesk CVE-2026-65646: Improper Input Validation

Plesk is affected by CVE-2026-65646. Improper neutralization of special elements in in Plesk's DNS zone management functionality allows remote authenticated users to disclose arbitrary local files and escalate privileges. Affected versions: before 18.0.79.11 | 18.0.80 before 18.0.80.7. CVSS base score: 9.9.

Critical 9.9 CVSS
Plesk AlmaLinux 8 AlmaLinux 9 CloudLinux 8 CloudLinux 9 Debian 11 Debian 12 Ubuntu 20.04 Ubuntu 22.04

Affected Versions

before 18.0.79.11 | 18.0.80 before 18.0.80.7

Default Update CMD

plesk installer --select-release-current --reinstall-patch

Fix Commands

AlmaLinux / Ubuntu / Debian / CloudLinux / Rocky Linux

plesk installer --select-release-current --reinstall-patch
plesk version

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.

Improper neutralization of special elements in in Plesk‘s DNS zone management functionality allows remote authenticated users to disclose arbitrary local files and escalate privileges.

Reference: https://nvd.nist.gov/vuln/detail/CVE-2026-65646

Frequently Asked Questions

What is CVE-2026-65646?
Improper neutralization of special elements in in Plesk's DNS zone management functionality allows remote authenticated users to disclose arbitrary local files and escalate privileges. Affected versions: before 18.0.79.11 | 18.0.80 before 18.0.80.7.
Is CVE-2026-65646 being exploited in the wild?
No confirmed public exploitation has been announced at the time of writing. With a CVSS base score of 9.9, apply the update on your next maintenance window and watch the vendor advisory for changes.
How do I fix CVE-2026-65646?
plesk installer --select-release-current --reinstall-patch. plesk version.
Which versions are affected?
Affected: before 18.0.79.11 | 18.0.80 before 18.0.80.7. Update to the latest release.

References

Security Advisories

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