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High · 8.8 CVE-2023-53956 EUVD-2025-204594GHSA-r9qg-6q9c-jpvx

Flatnux 2021-03.25 Authenticated File Upload Remote Code Execution

Published Dec 19, 2025 · Updated Apr 7, 2026 · Assigned by VulnCheck

Description

Flatnux 2021-03.25 contains an authenticated file upload vulnerability that allows administrative users to upload arbitrary PHP files through the file manager. Attackers with admin credentials can upload malicious PHP scripts to the web root directory, enabling remote code execution on the server.

Affected products

VendorProductAffectedFixed
altervista flatnux 2021-03.25 —

References