CVE-2026-50040
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 · uneditedStorage Concentrator (SC & SCVM) is vulnerable to reflected cross-site scripting due to unsanitized content being echoed back in 404 error pages. An attacker can craft a malicious URL that, when visited by an authenticated user, causes arbitrary script content to execute within the victim's browser session in the context of the application. This could be leveraged to steal session cookies, redirect users, or perform unauthorized actions on behalf of the victim.
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 confidenceStorage Concentrator (SC & SCVM) contains a reflected XSS vulnerability where unsanitized user-supplied input is echoed in 404 error pages. An attacker can craft a malicious URL containing script content that executes in the context of an authenticated user's session when they visit the link.
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
- None
- User interaction
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
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 SC or SCVM product is deployedIdentify if Storage Concentrator (SC or SCVM) is installed in your environment. Look for processes named 'sc', 'scvm', or 'storage-concentrator', or check installed software listings for these products.Affected if SC or SCVM is not present in the environment
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Determine installed versionRun the command 'sc --version' or 'scvm --version' if available, or check the product's about/help page or configuration files for version information.Affected if Version cannot be determined or verified against known affected releases
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Verify web interface is accessibleAttempt to reach the SC/SCVM web interface via HTTP/HTTPS. Note the base URL of the Storage Concentrator service.Affected if Web interface is not accessible or not configured
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Test 404 page for reflected inputCraft a URL to a non-existent path on the SC/SCVM web interface with a test parameter such as '?test=<script>alert(1)</script>' and examine the 404 response page source.Affected if The 404 response reflects URL parameters without HTML encoding (script tags appear literally in the page)
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Confirm authentication requirementsVerify whether the web interface requires valid authentication sessions. Check if unauthenticated requests are rejected or redirected to login.Affected if No authentication is required (though the vulnerability still exists, the specific CVSS vector notes authenticated context)
If SC or SCVM is present and its 404 error pages reflect URL parameters without sanitization, the environment is vulnerable to this reflected XSS; the attack requires a user with an active session to click the malicious link.
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 proper input validation and output encoding on all error pages, specifically ensuring that user-supplied path parameters are sanitized before being rendered in 404 responses.
- Consultation2.0 h
- Implementation4.0 h
- Testing2.0 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 $2,848.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-50040 — 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-2026-50040 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
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