CVE-2025-66430: Plesk 18.0 has Incorrect Access Control.

This month

CRITICAL 9.1REMOTEUPGRADE

CVE-2025-66430 is a critical-severity flaw (CVSS 9.1) affecting plesk. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Plesk 18.0 has Incorrect Access Control.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 54%)
CISA exploited list	No
Weakness	CWE-284
Published	2025-12-12
Last modified	2026-10-14

Publisher (CNA): MITRE · Vendor: plesk

Last updated 2026-10-14 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-12-12 16:15 UTCPublished CVE record published
2026-10-14 17:10 UTCUpdated Record last modified

plesk plesk UPGRADE

Affected: >= 18.0.70 and < 18.0.73.5 · >= 18.0.74 and < 18.0.74.2

Fixed in: 18.0.73.5, 18.0.74.2

Safe to downgrade to: a release before 18.0.70

1. Check installed version

apt-cache policy plesk || rpm -q plesk || plesk --version

2. UPGRADE to 18.0.73.5 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade plesk

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade plesk

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 18.0.70 (Debian / Ubuntu)

apt-cache madison plesk sudo apt install plesk=<VERSION_BEFORE_18.0.70> sudo apt-mark hold plesk

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list plesk sudo dnf downgrade plesk-<VERSION_BEFORE_18.0.70> sudo dnf versionlock add plesk

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-66430?

plesk: upgrade to 18.0.73.5, 18.0.74.2. Exact commands for each OS are on this page.

Is CVE-2025-66430 being exploited?

CVE-2025-66430 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-66430 affect?

CVE-2025-66430 affects plesk. Severity is critical (CVSS 9.1). Plesk 18.0 has Incorrect Access Control.

How urgent is CVE-2025-66430?

Priority 48/100. Critical severity; Remotely exploitable, no login, no user action

References

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