CVE-2017-12139
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 · uneditedXOOPS Core 2.5.8 has stored XSS in imagemanager.php because of missing MIME type validation in htdocs/class/uploader.php.
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 confidenceStored XSS vulnerability in XOOPS Core 2.5.8 allows attackers to upload files with malicious MIME types through the uploader class (htdocs/class/uploader.php), which are then served via imagemanager.php without proper validation, enabling arbitrary JavaScript execution in users' browsers.
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= 2.5.8CVSS 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:3.0/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 XOOPS Core versionLocate the version file (typically version.php in include directory or check admin panel system info) and compare the version number to 2.5.8Affected if The installed version is exactly 2.5.8
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Verify uploader.php existsCheck for the presence of htdocs/class/uploader.php in the web rootAffected if The file exists and the upload functionality is accessible to users
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Check imagemanager.php accessibilityVerify htdocs/imagemanager.php exists and is accessible via web (this is the file serving component)Affected if imagemanager.php is present and serves uploaded files without MIME validation
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Inspect upload configurationReview the uploader class configuration in htdocs/class/uploader.php for MIME type validation logic (look for any allowMime or similar array)Affected if The uploader accepts MIME types without server-side content validation or has an overly permissive MIME whitelist
If running XOOPS Core 2.5.8 with the uploader and imagemanager components accessible, the environment is vulnerable to stored XSS via malicious file uploads.
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 MIME type validation using file content inspection (magic bytes) rather than client-supplied headers, whitelist allowed file types, and add Content Security Policy headers to mitigate XSS execution.
- Consultation2.0 h
- Implementation4.0 h
- Testing2.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,560.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2017-12139 — 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-2017-12139 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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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.
- 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