CVE-2021-23835: Flatcore

Medium severity, CVSS 4.9. EPSS: 1.7% chance of exploitation in the next 30 days.

An issue was discovered in flatCore before 2.0.0 build 139. A local file disclosure vulnerability was identified in the docs_file HTTP request body parameter for the acp interface. This can be exploited with admin access rights. The affected parameter (which retrieves the contents of the specified file) was found to be accepting malicious user input without proper sanitization, thus leading to retrieval of backend server sensitive files, e.g., /etc/passwd, SQLite database files, PHP source code, etc.

Affected products

• Flatcore Flatcore: up to and including 2.0.0

Published 2021-01-15. Last modified 2026-06-17.