CVE-2025-15009: 1000mz Chestnutcms

High severity, CVSS 8.8. EPSS: 0.3% chance of exploitation in the next 30 days.

A flaw has been found in liweiyi ChestnutCMS up to 1.5.8. This vulnerability affects the function FilenameUtils.getExtension of the file /dev-api/common/upload of the component Filename Handler. Executing manipulation of the argument File can lead to unrestricted upload. The attack may be launched remotely. The exploit has been published and may be used.

Affected products

• 1000mz Chestnutcms: up to and including 1.5.8

Published 2025-12-22. Last modified 2026-06-17.