CVE-2023-53933

HIGH 8.8

Serendipity 2.4.0 Authenticated Remote Code Execution via File Upload

CVSS Score

8.8

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-434
Vendor	s9y
Product	serendipity
Published	Dec 17, 2025
Last Updated	Apr 7, 2026

Stay Ahead of the Next One

Get instant alerts for s9y serendipity

Be the first to know when new high vulnerabilities affecting s9y serendipity are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

s9y / Serendipity

2.4.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

exploit-db.com: https://www.exploit-db.com/exploits/51372 docs.s9y.org: https://docs.s9y.org/ vulncheck.com: https://www.vulncheck.com/advisories/serendipity-authenticated-remote-code-execution-via-file-upload

Credits

Mirabbas Ağalarov