CVE-2023-53871Public exploitNetwork attack vector

Unauthenticated PHP execution via crafted HTML upload

Published Dec 15, 2025 · Updated Dec 15, 2025

Unrestricted file upload in Soosyze CMS 2.0.0 allows remote attackers to execute embedded PHP by submitting a crafted HTML file. The upload mechanism accepts an HTML file containing PHP code and stores it where a subsequent request invokes the embedded script instead of treating it only as inert markup. No authentication or user interaction is required; the demonstrated payload calls phpinfo(), exposing server paths, while arbitrary script execution permits server-side code execution.

CVSS severity6.9
Medium
EPSS probability0.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in Soosyze CMS 2.0.0 allows remote attackers to execute embedded PHP by submitting a crafted HTML file. The upload mechanism accepts an HTML file containing PHP code and stores it where a subsequent request invokes the embedded script instead of treating it only as inert markup. No authentication or user interaction is required; the demonstrated payload calls phpinfo(), exposing server paths, while arbitrary script execution permits server-side code execution.

The record

CVE
CVE-2023-53871
Published
Dec 15, 2025
Updated
Dec 15, 2025
Vendor
Soosyze
Product
Soosyze CMS
Classifications
CWE-434, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 15, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 15, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Soosyze · Soosyze CMSversion=2.0.0

Published CVSS scores

6.9VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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