CVE-2018-16731

CRITICAL

CScms 4.1 allows arbitrary file upload by (for example) adding the php extension to the default filetype list (gif, jpg, png), and then providing a .php pathname within fileurl JSON data.

Affects 1 product across 1 vendor.

CVSS 3.09.8
EPSS1.5%
Percentile74th
PatchUnknown
CVSS Vector — Plain English Remotely exploitable over the network, low complexity, no authentication required, no user interaction needed, impact contained to the vulnerable component, full confidentiality impact, full integrity impact, full availability impact.
CWE Weakness Definitions
CWE-434: Unrestricted Upload of File with Dangerous Type

Application allows file uploads without validating type, enabling upload of executable code or web shells.

Related Attack Patterns (CAPEC)
CAPEC-1 Accessing Functionality Not Properly Constrained by ACLs
via CWE-434

Mapping is CWE-to-CAPEC per MITRE CAPEC 3.9.

◆ AI Analysis — automated analysis, not human-reviewed

This vulnerability was disclosed in 2018. A critical vulnerability affects Chshcms systems (CVE-2018-16731). No public exploit code is currently available. Isolate affected systems if patching is not feasible.

BSID: BS-2018-GLOBAL-341348-C • Model: rule-based-v1 • Confidence: MEDIUM

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Frequently Asked Questions
What is CVE-2018-16731?
This vulnerability was disclosed in 2018. A critical vulnerability affects Chshcms systems (CVE-2018-16731). No public exploit code is currently available. Isolate affected systems if patching is not feasible.
What is the CVSS score for CVE-2018-16731?
CVE-2018-16731 has CVSS 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS: 1.5%.
Is CVE-2018-16731 actively exploited?
No confirmed active exploitation of CVE-2018-16731 as of 2026-05-30.
How do I remediate CVE-2018-16731?
Priority: MEDIUM.
What systems are affected by CVE-2018-16731?
CVE-2018-16731 affects Chshcms Cscms.
Vulnerability Details
CVE IDCVE-2018-16731
BSIDBS-2018-GLOBAL-341348-C BreachSpider Global ID
CVSS VectorCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published2018-09-08
Last Modified2024-11-21
ICS Relevance0%
Weakness (CWE)
Unrestricted Upload of File with Dangerous Type
SourceNVD
Official Description

CScms 4.1 allows arbitrary file upload by (for example) adding the php extension to the default filetype list (gif, jpg, png), and then providing a .php pathname within fileurl JSON data.

Source: NIST NVD / MITRE CVE Database

Attack Vector Analysis — CITED Relevance

Vulnerability details: CScms 4.1 allows arbitrary file upload by (for example) adding the php extension to the default filetype list (gif, jpg, png), and then providing a .php pathname within fileurl JSON data. CVSS vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Exploitation Likelihood: LOW

Affected Products
VendorProductAffected Versions
Chshcms Cscms 4.1
Remediation

No official vendor advisory link on record. See the CVE record →

Threat Intelligence
● Threat Intelligence Validated: October 2026 | Threat Age: 2959 Days
CISA known-exploitedNot in KEV catalog
Public ExploitNot confirmed
PoC CodeNot confirmed
AI Enrichment Record — provenance & audit hash
Modelrule-based-v1
ConfidenceMEDIUM
Enriched At2026-05-24
SHA-512 Audit Hashb079debefa7deee3315b800065cb069d773b25c3428bab8ef7dcf422c1da4e0dcd5f5ad8510bde578a29eb059ca1730548b8758e40b450c0665739b8970ad566
Related CVEs affecting Chshcms
CVE-2020-28102 9.8 cscms v4.1 allows for SQL injection via the "js_del" function. CVE-2018-17126 9.8 CScms 4.1 allows remote code execution, as demonstrated by 1');eval($_POST[cm... CVE-2020-22848 9.8 A remote code execution (RCE) vulnerability in the \Playsong.php component of... CVE-2020-21238 9.8 An issue in the user login box of CSCMS v4.0 allows attackers to hijack user ... CVE-2020-28103 9.8 cscms v4.1 allows for SQL injection via the "page_del" function.
View all Chshcms CVEs →

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