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CVE-2025-34080· NVD / CVE Program· CNA VulnCheck

CONPROSYS HMI System (CHS) < 3.7.7 Reflected Cross-Site Scripting

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.

MediumCVSS 5.1 · v4.0—No exploit Fix available
Published
Jul 1, 2025
Updated
Jun 17, 2026
EPSS
1.2% · 66th percentile
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Action score

20

Monitor

Low priority for now.

CVSS
20 / 40 · 5.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · VulnCheck
5.1
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Noroxi analysis

No Noroxi analysis for this record yet

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Affected systems

VendorProduct
contecconprosys hmi system

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • contec conprosys hmi systembefore 3.7.7

Versions reported by the vendor

Affected version ranges reported by the assigning authority (VulnCheck). Independent of NVD's CPE analysis and usually ahead of it.

  • Contec Co.,Ltd. CONPROSYS HMI System (CHS)

    • before 3.7.7affected · semver

Same product

contec: all records

Other highest-scoring records for the same primary product.

  • CVE-2022-44456CONPROSYS HMI System (CHS) Ver.3.4.4?and earlier allows a remote unauthenticated attacker to execute an arbitrary OS command on the server w
    60This week
  • CVE-2023-29154SQL injection vulnerability exists in the CONPROSYS HMI System (CHS) versions prior to 3.5.3.
    40Plan
  • CVE-2023-28651Cross-site scripting vulnerability exists in CONPROSYS HMI System (CHS) versions prior to 3.5.3.
    38Monitor
  • CVE-2023-28657Improper access control vulnerability exists in CONPROSYS HMI System (CHS) versions prior to 3.5.3.
    35Monitor
  • CVE-2023-28713Plaintext storage of a password exists in CONPROSYS HMI System (CHS) versions prior to 3.5.3.
    32Monitor
  • CVE-2023-28399Incorrect permission assignment for critical resource exists in CONPROSYS HMI System (CHS) versions prior to 3.5.3.
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Contec Co.,Ltd. CONPROSYS HMI System (CHS)3.7.7Vendor (CNA)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
A
Scope
X

Weakness class (CWE)

CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/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

nvd-secondary

Root cause

User content is inserted into the page as HTML. The browser interprets the content as code rather than data.

The bug in code

The whole CWE-79 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

ts
commentEl.innerHTML = comment.body;

Fixed

ts
commentEl.textContent = comment.body;

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records