CVE-2023-53933

moderate-risk
Published 2025-12-17

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.

Do I need to act?

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0.59% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
8
CVSS 8.8/10 High
NETWORK / LOW complexity

Affected Products (1)

Affected Vendors

S9Y

References (4)

Product https://docs.s9y.org/
Exploit https://www.exploit-db.com/exploits/51372
Third Party Advisory https://www.vulncheck.com/advisories/serendipity-authenticated-remote-code-execu...
Exploit https://www.exploit-db.com/exploits/51372
37
/ 100
moderate-risk
Severity 30/34 · Critical
Exploitability 2/34 · Minimal
Exposure 5/34 · Minimal