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Conprosys Hmi System CVE-2025-34080

| EUVDEUVD-2025-19659 MEDIUM
Cross-site Scripting (XSS) (CWE-79)
2025-07-01 disclosure@vulncheck.com
PHP XSS Conprosys Hmi System Contec
6.1
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

Attackers can steal session cookies, redirect users to malicious sites, deface content, or perform actions on behalf of authenticated users. With a CVSS score of 6.1 (MEDIUM), this represents a moderate risk.
Exploit ScenarioDerived

An attacker injects a JavaScript payload into a vulnerable input field. When another user views the page, the script executes in their browser, stealing their session token.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 16, 2026

The Contec Co.,Ltd. CONPROSYS HMI System (CHS) is vulnerable to Cross-Site Scripting (XSS) in the getqsetting.php functionality that could allow reflected execution of scripts in the browser on interaction.This issue affects CONPROSYS HMI System (CHS): before 3.7.7.

Earlier versions of this analysis (1)
v1 Mar 16, 2026 - 01:42 CVSS 6.1

RemediationAI

Encode all user-supplied output contextually (HTML, JS, URL). Implement Content Security Policy (CSP) headers. Use HTTPOnly and Secure cookie flags.

Affected VersionsENISA

CONPROSYS HMI System (CHS) 0 <3.7.7

Affected Packages

euvd conprosys_hmi_system_chs fix: 3.7.7

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

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Technical ContextAI · show details

Cross-site scripting (XSS) allows injection of client-side scripts into web pages viewed by other users due to insufficient output encoding.

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

NVD PRIMARY 6.1 MEDIUM
AV:N/AC:L/PR:N/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
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

Lifecycle Timeline

2
Patch available
Apr 16, 2026 - 05:29 EUVD
3.7.7
CVE Published
Jul 01, 2025 - 18:15 nvd
MEDIUM 6.1

Executive ViewAI

Why It Matters

CVE-2025-34080 presents moderate security risk, a cross-site scripting vulnerability rated CVSS 6.1. Attackers could inject scripts to steal sessions or perform actions as authenticated users. Organizations should apply vendor updates when available and monitor for exploitation.

Business Impact: Low
Compensating Controls

Apply vendor patch. If patching is delayed: implement CSP headers, enable HttpOnly cookies, deploy WAF XSS rules.

Threat Intelligence Overview

EPSS Score
0.0%
Top 86% exploitable
Data Quality
4 sources
Confidence: Medium
EUVD 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 0.0%
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
Defer
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
No
Human Impact
Low

Priority Score

30
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +30
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.

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-2023-22373 MEDIUM
5.4 Jan 20

Cross-site scripting vulnerability in CONPROSYS HMI System (CHS) Ver.3.4.5 and earlier allows a remote authenticated att
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)

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CVE-2023-40000 HIGH POC
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CVE-2016-8581 MEDIUM POC
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CVE-2013-5223 MEDIUM POC
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CVE-2025-52367 MEDIUM POC
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Same technique XSS

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CVE-2017-9248 CRITICAL POC
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CVE-2013-1710 CRITICAL POC
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CVE-2024-52875 HIGH POC
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References

Advisories & patches
ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2025-34080 REF https://jvn.jp/en/vu/JVNVU92266386/ REF https://www.vulncheck.com/advisories/conprosys-hmi-system-reflected-xss

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