Security readout for executives and security teams
Plain-English summary
A flaw in Plesk’s database-cloning process can let a customer or reseller run arbitrary code with the database server administrator’s authority. Successful abuse could compromise hosted databases and their confidentiality, integrity, and availability. The supplied record rates the issue critical.
Executive priority
Prioritize remediation immediately because successful exploitation could give a tenant database-administrator-level code execution and affect hosted data. Confirm all Plesk estates and managed hosting providers are patched. Although active exploitation is not established, the critical impact and low-privilege attack scenario justify urgent action.
Technical view
CVE-2026-64639 is a CWE-266 privilege-management flaw affecting Plesk releases from 18.0.52 before the vendor’s fixed releases 18.0.79.6 and 18.0.80.2. The vulnerable cloning workflow can execute attacker-controlled code under the database server administrator account. The supplied CVSS 4.0 score is 9.3.
Likely exposure
Exposure is likely where affected Plesk versions are installed and customer or reseller accounts can access database-cloning functionality. Internet-facing hosting environments and multi-tenant control panels warrant urgent review. The supplied sources do not identify particular operating systems, configurations, or databases as prerequisites.
Exploitation context
The supplied sources do not establish active exploitation, and the CVE is not listed as KEV in the bundle. Exploitation is described as possible by a low-privileged customer or reseller through database cloning. Treat credible tenant accounts as a meaningful threat boundary.
Researcher notes
The bundle describes exploitation by a low-privileged customer or reseller, while the supplied CVSS vector states PR:N. This inconsistency should be resolved against the authoritative CVE and vendor records. No exploit method, observed campaign, workaround, or forensic indicator is provided. Version interpretation should follow Plesk’s branch-specific advisory.
Mitigation direction
- Update affected Plesk installations to 18.0.79.6, 18.0.80.2, or a later vendor-supported release.
- Follow the linked Plesk advisory for branch-specific update guidance.
- Restrict database-cloning access for customer and reseller accounts until updates are verified.
- Review privileged database activity for unexpected code execution or changes.
Validation and detection
- Inventory every Plesk instance and record its exact installed version.
- Confirm each installation is 18.0.79.6, 18.0.80.2, or later, as applicable.
- Identify customer and reseller accounts permitted to clone databases.
- Review database administrator logs around cloning operations for anomalous processes or changes.
- Verify updates succeeded and database-cloning operations still enforce intended privilege boundaries.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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CWE-266: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupDatabase behavior lookup
The CVE wording references database injection or access, so collection and exfiltration review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-64639 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.3 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N——hackeroneVulnerability scoring details
Base CVSS 4.0 score
9.3CriticalVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Incorrect Privilege Assignment
Incorrect Privilege Assignment represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.