CVE-2026-6555
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 ProSolution WP Client plugin for WordPress is vulnerable to Arbitrary File Upload in versions up to, and including, 2.0.0. This is due to an array validation mismatch where only the first file in the upload array undergoes extension and MIME type validation, while all files are processed and uploaded to a web-accessible directory. This makes it possible for unauthenticated attackers to upload malicious PHP files and achieve remote code execution by sending a valid first file followed by a malicious file.
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 ProSolution WP Client WordPress plugin has an array validation bypass in its file upload functionality. The plugin only validates the first file in an upload array for extension and MIME type, but processes and saves ALL files in the array to a web-accessible directory. Unauthenticated attackers can bypass security checks by sending a legitimate file (e.g., an image) as the first array element followed by a malicious PHP file, achieving remote code execution.
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
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/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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Confirm ProSolution WP Client plugin is installedCheck the WordPress plugins directory or access the Plugins admin page to list all installed pluginsAffected if The ProSolution WP Client plugin appears in the list of installed plugins
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Identify the installed plugin versionView the plugin details in the WordPress admin under Plugins > Installed Plugins, or inspect the plugin's main PHP file header for the Version attributeAffected if The version listed is 2.0.0 or lower
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Verify the file upload functionality is activeLocate the upload handler script within the plugin (commonly in includes/ or handlers/ directories) and confirm it is accessible and not disabled via configurationAffected if The upload functionality is present and accessible on the site
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Confirm upload directory is web-accessibleCheck the plugin configuration or code for the upload path, then verify the directory exists within the web root and is accessible via HTTPAffected if The designated upload directory is located under the web root (public_html or similar) and serves files via the web server
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Scan upload directory for unauthorized scriptsList all files in the plugin's upload directory (typically wp-content/uploads/prosolution/ or similar) and inspect for .php files that were not intentionally uploadedAffected if Unexpected .php files or other executable scripts are found in the upload directory
A user is affected if the ProSolution WP Client plugin version is 2.0.0 or lower AND the file upload functionality is active and accessible, allowing potential unauthenticated PHP 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 dataUpgrade to a patched version of the plugin that validates all files in the upload array, not just the first. If no patch exists, disable the plugin or implement web-server-level restrictions on executable file uploads to the uploads directory.
- Consultation3.0 h
- Implementation4.0 h
- Testing4.0 h
- Review / QA3.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,936.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-6555 — 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-2026-6555 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