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VaelsysApplication

CVE-2025-8259

CRITICAL · 9.8 CVSS v3.1 Published 2025-07-28
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
100/100
Remediation priority · Urgent
Public exploit Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
A vulnerability was identified in Vaelsys VaelsysV4 up to 5.1.0/5.4.0. Affected by this issue is the function execute_DataObjectProc of the file /grid/vgrid_server.php of the component Web interface. Such manipulation of the argument xajaxargs leads to os command injection. The attack can be executed remotely. The exploit is publicly available and might be used. Upgrading to version 5.1.1 and 5.4.1 can resolve this issue. It is suggested to upgrade the affected component.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

A critical OS command injection vulnerability exists in Vaelsys VaelsysV4 web interface (versions up to 5.1.0/5.4.0). The execute_DataObjectProc function in /grid/vgrid_server.php accepts user input through the xajaxargs parameter without proper sanitization, allowing attackers to execute arbitrary operating system commands remotely. A publicly available exploit increases urgency.

MitigationUpgrade immediately to versions 5.1.1 or 5.4.1 as specified by the vendor. Given the critical CVSS score and public exploit availability, treat this as an emergency patch with priority scheduling.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
VaelsysApplication
Affected:= 4.1.0

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Confirm VaelsysV4 web interface is installed
    Check if the Vaelsys web interface is accessible by accessing the application's URL. Look for Vaelsys login page or error messages indicating the application is present.
    Affected if The VaelsysV4 web interface is accessible on the network.
  2. Identify the installed Vaelsys version
    Check the application's admin panel, about page, or version information typically found in the footer or system settings. Alternatively, inspect HTTP response headers for version disclosure.
    Affected if The installed version is 4.1.0 or any version up to and including 5.1.0 or 5.4.0.
  3. Verify the vulnerable endpoint exists
    Check for the presence of the file /grid/vgrid_server.php on the web server by accessing it directly or using a web directory scan.
    Affected if The file /grid/vgrid_server.php exists and is accessible via HTTP.
  4. Confirm xajaxargs parameter is accepted
    Send a test request to /grid/vgrid_server.php with the xajaxargs parameter to verify the application accepts this input. Observe if the application processes the parameter without immediate rejection.
    Affected if The application accepts and processes the xajaxargs parameter without proper sanitization.

If VaelsysV4 is installed and the version falls within 4.1.0 through 5.1.0 or 5.4.0 with the vulnerable /grid/vgrid_server.php endpoint accessible, the environment is affected by CVE-2025-8259.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Upgrade immediately to versions 5.1.1 or 5.4.1 as specified by the vendor. Given the critical CVSS score and public exploit availability, treat this as an emergency patch with priority scheduling.

Recommended fix High confidence

5.1.1 or 5.4.1 (depending on your current version branch)

  1. 1. Back up the current Vaelsys VaelsysV4 installation and database before proceeding with the upgrade.
  2. 2. Identify your current version branch (5.1.x or 5.4.x) by checking the installed version.
  3. 3. Download Vaelsys VaelsysV4 version 5.1.1 (if on 5.1.x branch) or version 5.4.1 (if on 5.4.x branch) from the official vendor source.
  4. 4. Install the upgraded version following the vendor's standard upgrade procedure.
  5. 5. Verify the installation was successful and the web interface is functioning properly.
  6. 6. Confirm the vulnerability is resolved by checking that the /grid/vgrid_server.php execute_DataObjectProc function no longer accepts unsanitized xajaxargs input.
Caveat Review vendor release notes for your specific version branch for any migration requirements or configuration changes before upgrading

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Vaelsys Scoped from the published advisory
  • Consultation4.0 h
  • Implementation3.0 h
  • Testing8.0 h
  • Review / QA4.0 h
19.0 hours of engineering $3,260
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-8259 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data