EUVD-2026-66764
GHSA-g8q6-5f8r-jhhf
Severity by source
AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Network-reachable panel feature exploitable by any low-privileged account (PR:L) with no interaction; injection breaks tenant scope (S:C) yielding full host confidentiality, integrity, and availability impact.
Primary rating from Vendor (hackerone).
CVSS VectorVendor: hackerone
Lifecycle Timeline
7DescriptionCVE.org
Improper neutralization of special elements in Plesk allows remote authenticated users to disclose arbitrary local files and escalate privileges.
AnalysisAI
Authenticated remote attackers against WebPros Plesk (versions before 18.0.79.8, and 18.0.80 through 18.0.80.3) can inject special elements into the DNS zone management functionality to read arbitrary files on the server and escalate their privileges. Because the CVSS scope is changed (S:C), a low-privileged panel user can break out of their intended boundary to compromise the underlying host with full confidentiality, integrity, and availability impact. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated Plesk account (PR:L) - any valid panel login such as a customer or reseller - with access to the DNS zone management functionality, which is the specific feature carrying the injection flaw. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.0 base score is 9.9 (AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H), driven by network reachability, low complexity, and a scope change from a low-privileged account to full host compromise. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: upgrade to Plesk 18.0.79.8 (for the 18.0.79.x and earlier line) or 18.0.80.4 (for the 18.0.80.x line) or later, as described in the Plesk support advisory (https://support.plesk.com/hc/en-us/articles/42877023875351-Vulnerability-CVE-2026-65646-in-Plesk-s-DNS-zone-management-functionality). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Plesk installations and confirm versions against the vulnerable ranges (before 18.0.79.8 and 18.0.80.0-18.0.80.3). …
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