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Conprosys Hmi System CVE-2023-22373

MEDIUM
Cross-site Scripting (XSS) (CWE-79)
2023-01-20 vultures@jpcert.or.jp
XSS Conprosys Hmi System Contec
5.4
CVSS 3.1 · NVD
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Vulnerability Assessment

Weakness
CWE
CWE-79
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Output encoding, context-aware escaping
MITRE ATT&CK

2 techniques across 2 tactics: Initial Access, Execution

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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Impact

CVSS score of 5.4 (MEDIUM). Attack characteristics: network attack vector, low complexity, low privileges required, user interaction required.
Exploit ScenarioDerived

A remote attacker could inject malicious scripts into web pages viewed by other users by sending crafted requests to the affected application.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 1.9% exploitation probability (EPSS)

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AnalysisAI

Cross-site scripting vulnerability in CONPROSYS HMI System (CHS) Ver.3.4.5 and earlier allows a remote authenticated attacker to inject an arbitrary script and obtain the sensitive information. Rated medium severity (CVSS 5.4), this vulnerability is remotely exploitable, low attack complexity. This Cross-Site Scripting (XSS) vulnerability could allow attackers to inject malicious scripts into web pages viewed by other users.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Sanitize all user input, use Content-Security-Policy headers, encode output contextually (HTML, JS, URL). Use frameworks with built-in XSS protection.

Affects your stack

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Technical ContextAI · show details

This vulnerability is classified as Cross-Site Scripting (XSS) (CWE-79), which allows attackers to inject malicious scripts into web pages viewed by other users. Cross-site scripting vulnerability in CONPROSYS HMI System (CHS) Ver.3.4.5 and earlier allows a remote authenticated attacker to inject an arbitrary script and obtain the sensitive information. Affected products include: Contec Conprosys Hmi System.

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

NVD PRIMARY 5.4 MEDIUM
AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

DescriptionNVD

Cross-site scripting vulnerability in CONPROSYS HMI System (CHS) Ver.3.4.5 and earlier allows a remote authenticated attacker to inject an arbitrary script and obtain the sensitive information.

Threat Intelligence Overview

EPSS Score
1.9%
Top 23% exploitable
Data Quality
2 sources
Confidence: Low
NVD CVE.org EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 1.9%
Patch available Yes
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

29
Low Medium High Critical
KEV: 0
EPSS: +2
CVSS: +27
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Cross-Site Scripting MEDIUM

Cross-Site Scripting occurs when an application accepts untrusted data and sends it to a web browser without proper validation or encoding.

Affected Products (CPE)NVD

cpe:2.3:a:contec:conprosys_hmi_system:*:*:*:*:*:*:*:*

More in Conprosys Hmi System

View all
CVE-2022-44456 CRITICAL
9.8 Dec 19

CONPROSYS HMI System (CHS) Ver.3.4.4?and earlier allows a remote unauthenticated attacker to execute an arbitrary OS com
CVE-2023-2758 MEDIUM POC
5.3 May 31

A denial of service vulnerability exists in Contec CONPROSYS HMI System versions 3.5.2 and prior. Rated medium severity

CVE-2023-28657 HIGH
8.8 Jun 01

Improper access control vulnerability exists in CONPROSYS HMI System (CHS) versions prior to 3.5.3. Rated high severity

CVE-2023-28713 HIGH
8.1 Jun 01

Plaintext storage of a password exists in CONPROSYS HMI System (CHS) versions prior to 3.5.3. Rated high severity (CVSS

CVE-2023-28399 HIGH
7.8 Jun 01

Incorrect permission assignment for critical resource exists in CONPROSYS HMI System (CHS) versions prior to 3.5.3. Rate
CVE-2025-34081 HIGH
7.5 Jul 01

The Contec Co.,Ltd. CONPROSYS HMI System (CHS) exposes a PHP phpinfo() debug page to unauthenticated users that may cont
CVE-2023-22339 HIGH
7.5 Jan 20

Improper access control vulnerability in CONPROSYS HMI System (CHS) Ver.3.4.5 and earlier allows a remote unauthenticate
CVE-2023-22331 HIGH
7.5 Jan 20

Use of default credentials vulnerability in CONPROSYS HMI System (CHS) Ver.3.4.5 and earlier allows a remote unauthentic
CVE-2023-29154 HIGH
7.2 Jun 01

SQL injection vulnerability exists in the CONPROSYS HMI System (CHS) versions prior to 3.5.3. Rated high severity (CVSS

CVE-2023-22324 MEDIUM
6.5 Jan 30

SQL injection vulnerability in the CONPROSYS HMI System (CHS) Ver.3.5.0 and earlier allows a remote authenticated attack
CVE-2025-34080 MEDIUM
6.1 Jul 01

The Contec Co.,Ltd. CONPROSYS HMI System (CHS) is vulnerable to Cross-Site Scripting (XSS) in the getqsetting.php functi
CVE-2023-22334 MEDIUM
5.3 Jan 20

Use of password hash instead of password for authentication vulnerability in CONPROSYS HMI System (CHS) Ver.3.4.5 and ea

Same weakness CWE-79 – Cross-site Scripting (XSS)

View all
CVE-2020-3580 MEDIUM POC
6.1
CVE-2013-7389 MEDIUM POC
4.3
CVE-2021-25299 MEDIUM POC
6.1
CVE-2014-2120 MEDIUM
6.1
CVE-2023-40000 HIGH POC
8.3
CVE-2016-8581 MEDIUM POC
6.1
CVE-2013-5223 MEDIUM POC
5.4
CVE-2025-52367 MEDIUM POC
5.4

Same technique XSS

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CVE-2017-9248 CRITICAL POC
9.8
CVE-2013-1710 CRITICAL POC
10.0
CVE-2024-52875 HIGH POC
8.8

References

Advisories & patches
PATCH https://jvn.jp/en/vu/JVNVU96873821 PATCH https://www.contec.com/api/downloadlogger?download=/-/media/Contec/jp/support/security-info/contec_security_chs_230110_en.pdf PATCH https://www.contec.com/download/contract/contract4/?itemid=ea8039aa-3434-4999-9ab6-897aa690210c&downloaditemid=866d7d3c-aae9-438d-87f3-17aa040df90b REF https://www.cisa.gov/uscert/ics/advisories/icsa-22-347-03

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