What is CVE-2025-66430?

CVE-2025-66430 is a critical-severity vulnerability in Plesk, classified under Improper Access Control. CVSS score: 9.1/10. Published 2025-12-12.

How severe is CVE-2025-66430?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Vulnerability in Plesk

CVE-2025-66430

Plesk 18.0 has Incorrect Access Control.

Published 2025-12-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.006 (43.8th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 43.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.006 · change: +0.001

Affected products

Plesk

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

docs.plesk.com/release-notes/obsidian/whats-new/ (Product)
support.plesk.com/hc/en-us/articles/36261922405015--CVE-2025-66430-Security-vul… (Vendor Advisory)

Frequently asked questions

What is CVE-2025-66430?: CVE-2025-66430 is a critical-severity vulnerability in Plesk, classified under Improper Access Control. CVSS score: 9.1/10. Published 2025-12-12.
How severe is CVE-2025-66430?: Critical severity. CVSS v3 base score is 9.1 out of 10.