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CVE-2023-53933

28
FAUCET Score

CVE-2023-53933 is a high-severity remote code execution vulnerability in Serendipity 2.4.0, allowing authenticated attackers to upload malicious PHP files with a .phar extension to execute arbitrary commands on the server. With a CVSS score of 8.8, this vulnerability presents a significant risk due to its low attack complexity and high impact on confidentiality, integrity, and availability. While no public exploits or active exploitation have been observed, and community discussion is minimal, the potential for severe compromise necessitates immediate patching.

Impacted Technologies

VendorProductVersion(s)CPE
2.4.0CPE matchmatch criteria
cpe:2.3:a:s9y:serendipity:2.4.0:-:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 4.0

8.7HIGH

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:X/V:X/RE:X/U:X

Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
VS Confidentiality
HIGH
VS Integrity
HIGH
VS Availability
HIGH
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.89%
Probability of exploitation in next 30 days
EPSS Percentile
55.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0089 is in the 51st percentile among its peer group of 17,844 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

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