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Unrestricted File UploadWeakness · CWE-434

CVE-2025-40678

MEDIUM · 5.3 CVSS v4.0 Published 2025-09-18
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
59/100
Remediation priority · Elevated
Remotely reachable 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
Unrestricted upload vulnerability for dangerous file types on Summar Software´s Portal del Empleado. This vulnerability allows an attacker to upload a dangerous file type by sending a POST request using the parameter “cctl00$ContentPlaceHolder1$fuAdjunto” in “/MemberPages/ntf_absentismo.aspx”.

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 · moderate confidence

Unrestricted file upload vulnerability in Summar Software's Portal del Empleado allows attackers to upload dangerous file types via the 'cctl00$ContentPlaceHolder1$fuAdjunto' parameter on the /MemberPages/ntf_absentismo.aspx endpoint. The application fails to properly validate uploaded file types before storing them, potentially enabling remote code execution if malicious executables or web shells are uploaded and subsequently accessed.

MitigationImplement strict server-side file type validation (extension, MIME type, and magic bytes/component analysis) before allowing uploads; store uploaded files outside the web root or with non-executable permissions; consider renaming files upon upload to prevent direct access.

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

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
Low
Authentication
X
User interaction
None
Scope
X

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

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. Identify Portal del Empleado installation
    Check for Summar Software's Portal del Empleado application in your web server's installed applications or IIS/Apache virtual directories. Look for directories named 'Portal del Empleado' or 'PortalEmpleado' under the web root.
    Affected if The application is present and running on the server.
  2. Verify vulnerable endpoint exists
    Access the URL path /MemberPages/ntf_absentismo.aspx on the web server hosting the portal. Check if the page loads and contains a file upload field.
    Affected if The endpoint is accessible and returns a page with a file upload form.
  3. Locate the upload parameter
    Inspect the HTML form on the ntf_absentismo.aspx page to identify the input field named 'cctl00$ContentPlaceHolder1$fuAdjunto' which handles file uploads.
    Affected if The upload parameter field is present in the form.
  4. Test file type validation
    Attempt to upload a test file with a non-standard extension (such as .exe, .asp, .php, or .txt renamed to .exe) via the identified parameter and observe the server response. Check if the upload succeeds without rejection.
    Affected if The server accepts file uploads without validating the file type or extension, allowing potentially dangerous file types.
  5. Check uploaded file storage location
    After a successful test upload, verify if the file is stored in a web-accessible directory (within the web root) and can be directly accessed via a URL.
    Affected if Uploaded files are stored in web-accessible directories and can be executed or accessed directly.

You are affected if Summar Portal del Empleado is installed, the /MemberPages/ntf_absentismo.aspx endpoint is accessible, and the application accepts file uploads without proper validation, allowing dangerous file types to be stored in web-accessible locations.

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.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Implement strict server-side file type validation (extension, MIME type, and magic bytes/component analysis) before allowing uploads; store uploaded files outside the web root or with non-executable permissions; consider renaming files upon upload to prevent direct access.

Have this fixed Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA3.0 h
21.0 hours of engineering $3,680
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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-2025-40678 in production — separate from our analysis above.

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What this is

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What belongs here
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  • Version or environment caveats, and links to real fixes
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