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CVE-2023-53933

8.8 · HIGH

Serendipity 2.4.0 contains a remote code execution vulnerability that allows authenticated attackers to upload malicious PHP files with .phar extension.

Published Dec 17, 2025CWE-434EPSS 1.02%

Overview

CVE-2023-53933 is a high-severity vulnerability. It was published on December 17, 2025 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refdocs.s9y.org/Refwww.exploit-db.com/exploits/51372Refwww.vulncheck.com/advisories/serendipity-authenticated-remote-code-execution-via-file-uploadRefwww.exploit-db.com/exploits/51372

How CyberStrike helps

Frequently asked questions

What is CVE-2023-53933?

CVE-2023-53933 is a high-severity vulnerability. It was published on December 17, 2025 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2023-53933?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2023-53933?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2023-53933?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-53933 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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