CVE-2023-53956

8.7 highEPSS 0.8%

High (8.7). EPSS 0.8% chance of exploitation in the next 30 days.

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.

Severity

CVSS 4.0

8.7 high

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS 3.1

8.8 high

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.8% chance of exploitation in the next 30 days; higher than 55% of CVEs (scores of 2026-10-31)
CWE: CWE-434
Published: 2025-12-19
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

References

http://flatnux.altervista.org/flatnux.html
https://www.exploit-db.com/exploits/51295
https://www.vulncheck.com/advisories/flatnux-authenticated-file-upload-remote-code-execution

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