Remote Code Execution Vulnerability in Serendipity by S9Y
CVE-2023-53933

8.7HIGH

Key Information:

Vendor

S9y

Status
Serendipity
Vendor
CVE Published:
17 December 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2023-53933?

A remote code execution vulnerability exists in Serendipity version 2.4.0, where authenticated users can exploit the system through an insecure media upload feature. By uploading malicious PHP files with the .phar extension, attackers may execute arbitrary commands on the server. This flaw underscores the importance of proper file validation and access control mechanisms to safeguard against such exploits.

Affected Version(s)

Serendipity 2.4.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2023-53933 - Proof of Concept

References

https://www.exploit-db.com/exploits/51372
exploit
https://docs.s9y.org/
product
https://www.vulncheck.com/advisories/serendipity-authenti...
third-party-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Mirabbas Ağalarov
JSON
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CVE-2023-53933 : Remote Code Execution Vulnerability in Serendipity by S9Y