CVE-2018-5259
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 · uneditedDiscuz! DiscuzX X3.4 allows remote authenticated users to bypass intended attachment-deletion restrictions via a modified aid parameter.
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 confidenceDiscuz! DiscuzX X3.4 contains an insecure direct object reference (IDOR) vulnerability in its attachment deletion functionality. Authenticated users can bypass intended access controls by manipulating the 'aid' parameter to delete attachments they do not own. This authorization bypass requires only standard user-level authentication.
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= x3.4CVSS 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
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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 Discuz! X3.4 installationLocate the version file - check /source/version.php or /static/version.js for the version string, or look for version in the admin control panel under System > Basic SettingsAffected if The installed version is exactly x3.4 (note: only this specific version is affected)
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Confirm attachment module is accessibleLog in as a standard registered user and navigate to the attachment/upload functionality in a forum post or message areaAffected if The attachment upload/delete features are enabled and accessible to regular users
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Identify attachment deletion endpointLocate the attachment deletion script - typically in /source/module/forum/forum_attachment.php or similar path under the source directory; examine the delete action handlingAffected if The attachment deletion code processes the 'aid' parameter without validating ownership
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Check authorization logic in deletion codeReview the PHP code that handles attachment deletion - look for the function that processes the 'aid' parameter and verify if it queries the current user's ID against the attachment owner before deletionAffected if The code lacks a check verifying that the authenticated user owns the specific attachment 'aid' before allowing deletion
If running Discuz! X3.4 with attachments enabled, the environment is affected because the attachment deletion function does not validate that the requesting user owns the attachment being deleted.
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 ownership validation and authorization checks before allowing attachment deletion operations. The application should verify that the authenticated user owns the specific attachment (aid) before processing deletion requests.
- Consultation3.0 h
- Implementation6.0 h
- Testing4.0 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 $4,224.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2018-5259 — 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-2018-5259 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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