CVE-2026-30579
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 · uneditedFile Thingie 2.5.7 is vulnerable to Cross Site Scripting (XSS). A malicious user can leverage the "upload file" functionality to upload a file with a crafted file name used to trigger a Javascript payload.
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 confidenceFile Thingie 2.5.7 contains a stored Cross Site Scripting (XSS) vulnerability in the file upload functionality. The application fails to properly sanitize or encode filenames during the upload process, allowing an attacker to embed malicious JavaScript code within the file name. When other users view the file listing, the crafted filename is rendered without proper encoding, causing the JavaScript payload to execute in the victim's browser.
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= 2.5.7CVSS 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
- User interaction
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- Low
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
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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Verify the installed version of File ThingieLocate the version information in the application (typically in an about page, footer, or version.php file). Check the application's main PHP files for a version constant or variable.Affected if The installed version is exactly 2.5.7
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Confirm the upload functionality is enabledLog into the application and check if a file upload interface exists. Look for upload forms, 'upload' or 'new file' buttons in the web interface, or check the application's configuration for upload-related settings.Affected if The upload feature is accessible and functional for the user account being tested
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Identify any existing uploaded files with suspicious filenamesAccess the file listing/browse page. Review all filenames in the directory. Look for filenames containing HTML tags (<script>, <img, <iframe, onload=, onerror=, javascript:), or unusual character sequences that may indicate test payloads.Affected if Any files exist with names containing HTML tags, JavaScript event handlers, or encoded XSS patterns in the visible file list
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Inspect the HTML source of the file listing pageView the page source (right-click > View Page Source in browser) while on the file listing/browse page. Search for filenames in the HTML and check if they are properly escaped or rendered as raw text.Affected if Filenames appear unescaped in the HTML (e.g., <script> tags are visible in source, or quotes are unescaped around attributes)
A user is affected if they are running version 2.5.7, the upload feature is enabled, and files with malicious filenames containing XSS payloads have been uploaded to the system and are rendered without encoding in the file listing.
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 dataSanitize all filenames during upload by removing or encoding special characters, and implement proper output encoding when displaying filenames in the file management interface. Consider adding a Content Security Policy (CSP) header as a defense-in-depth measure.
- Consultation2.0 h
- Implementation3.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-30579 — 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-2026-30579 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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