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Vulnerability record · CVE-2023-53933 · published 17 December 2025

CVE-2023-53933: S9y serendipity unrestricted file upload vulnerability

S9y · Serendipity

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.

8.7 CVSS 4.0 High EPSS 1.0% · top 38.1% CWE-434 · Unrestricted file upload
8.7CVSS 4.0 base score
1.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 3 tagged exploit
17 Jun 2026Last modified by NVD

Description

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://docs.s9y.org/ Product
https://www.exploit-db.com/exploits/51372 ExploitThird Party AdvisoryVDB Entry
https://www.vulncheck.com/advisories/serendipity-authenticated-remote-code-execution-via-file-upload ExploitThird Party Advisory
https://www.exploit-db.com/exploits/51372 ExploitThird Party AdvisoryVDB Entry

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2005-1449S9y serendipity vulnerabilityUnknown vulnerability in serendipity_config_local.inc.php for Serendipity before 0.8 has unknown impact.EPSS 1.4%10.0CVE-2005-1452S9y serendipity vulnerabilitySerendipity before 0.8 allows Chief users to "hide plugins installed by other users."EPSS 1.4%9.8CVE-2020-10964S9y serendipity unrestricted file upload vulnerabilitySerendipity before 2.3.4 on Windows allows remote attackers to execute arbitrary code because the filename of a renamed file may end with a dot. This…EPSS 2.8%9.8CVE-2011-1134S9y serendipity unrestricted file upload vulnerabilityCross-Site Scripting (XSS) in Xinha, as included in the Serendipity package before 1.5.5, allows remote attackers to execute arbitrary code in the im…EPSS 3.0%9.8CVE-2016-10752S9y serendipity unrestricted file upload vulnerabilityserendipity_moveMediaDirectory in Serendipity 2.0.3 allows remote attackers to upload and execute arbitrary PHP code because it mishandles an extensi…EPSS 2.3%9.8CVE-2016-10082S9y serendipity improper access control vulnerabilityinclude/functions_installer.inc.php in Serendipity through 2.0.5 is vulnerable to File Inclusion and a possible Code Execution attack during a first-…EPSS 2.9%8.8CVE-2023-31576S9y serendipity unrestricted file upload vulnerabilityAn arbitrary file upload vulnerability in Serendipity 2.4-beta1 allows attackers to execute arbitrary code via a crafted HTML or Javascript file.EPSS 1.1%8.8CVE-2017-8101S9y serendipity cross-site request forgery vulnerabilityThere is CSRF in Serendipity 2.0.5, allowing attackers to install any themes via a GET request.EPSS 0.60%

Source: NIST National Vulnerability Database (record CVE-2023-53933), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.