CVE-2026-34027
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 · uneditedThe Wertheim SafeController Software, AssemblyVersion 6.15.8328.28014, contains insufficient server-side file type validation in the /safe/contract/uploadcustomdocuments endpoint. The application validates uploaded files based on the user-controlled HTTP Content-Type value and accepts the upload if this value contains an allowed string such as pdf, jpeg, tiff, or png. An authenticated attacker with any role or permission level can spoof the Content-Type value and upload arbitrary file content.
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 confidenceThe Wertheim SafeController Software's /safe/contract/uploadcustomdocuments endpoint performs file type validation based solely on the user-supplied HTTP Content-Type header rather than inspecting actual file content. An authenticated attacker can manipulate this header to bypass validation and upload arbitrary file types to the server.
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:N/VI:L/VA:N/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 checksWork through these to decide whether this CVE applies to you.
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Confirm Wertheim SafeController Software is installedLocate the software installation directory or check for running services related to SafeController. Look for the application binary or service process.Affected if The software is present and running
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Verify the uploadcustomdocuments endpoint existsCheck application routing/configuration files for the /safe/contract/uploadcustomdocuments endpoint path.Affected if The endpoint is present in the application
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Check if authentication is required for the endpointReview access control configuration or test the endpoint with and without valid credentials.Affected if The endpoint accepts authenticated requests (even if auth is required, an authenticated attacker could exploit this)
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Inspect file upload validation logicExamine server-side code or configuration that handles file type validation for uploads. Look for logic that only checks the Content-Type header versus actual file content inspection.Affected if Validation relies solely on Content-Type header without inspecting file content/headers
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Test for file type bypassSend a crafted request with manipulated Content-Type header (e.g., image/jpeg) containing a different file type (e.g., executable) to the upload endpoint.Affected if The server accepts and stores files with mismatched Content-Type and actual file type
A user is affected if the Wertheim SafeController Software is running with the /safe/contract/uploadcustomdocuments endpoint that validates file types based only on the HTTP Content-Type header rather than inspecting actual file content.
Generated from the published advisory. Verify against your own configuration.
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 dataImplement server-side validation that checks actual file content (magic bytes/file signatures) and validates file extensions server-side, rejecting any upload that does not match expected file types regardless of the provided Content-Type header.
- Consultation3.0 h
- Implementation6.0 h
- Testing3.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,984.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-34027 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-34027 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- 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