CVE-2023-53933 HIGH

CVE-2023-53933: Serendipity 2.4.0 Authenticated Remote Code Execution via File Upload

Vendor S9Y
Product Serendipity
Weakness CWE-434 · Unrestricted file upload
Published December 17, 2025
Last update April 7, 2026

CVSS base score

8.7/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality
Integrity

CVSS vector

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

What the vulnerability does

01Description

Serendipity 2.4.0 contains a remote code execution vulnerability that allows authenticated attackers to upload malicious PHP files with .phar extension. Attackers can upload files with system command payloads to the media upload endpoint and execute arbitrary commands on the server.

Key dates

02Disclosure timeline

December 17, 2025 CVE published
April 7, 2026 Record updated