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CVE-2026-64637

9.9 · CRITICAL

Improper privilege management in the XML-RPC API of Plesk before 18.0.80, allows an authenticated reseller to obtain an administrative session for the root user account.

Published Aug 7, 2026CWE-269EPSS 0.47%

Overview

CVE-2026-64637 is a critical-severity vulnerability. It was published on August 7, 2026 and has a CVSS 3.0 base score of 9.9 (CRITICAL).

This vulnerability has a CVSS 3.0 base score of 9.9, rated CRITICAL. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

Improper privilege management in the XML-RPC API of Plesk before 18.0.80, allows an authenticated reseller to obtain an administrative session for the root user account.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refsupport.plesk.com/hc/en-us/articles/42432168683799

How CyberStrike helps

Frequently asked questions

What is CVE-2026-64637?

CVE-2026-64637 is a critical-severity vulnerability. It was published on August 7, 2026 and has a CVSS 3.0 base score of 9.9 (CRITICAL).

How severe is CVE-2026-64637?

This vulnerability has a CVSS 3.0 base score of 9.9, rated CRITICAL. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-64637?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-64637?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-64637 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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