ProSolution WP Client <= 2.0.0 - Unauthenticated Arbitrary File Upload via 'files'
Summary
| CVE | CVE-2026-6555 |
|---|---|
| State | PUBLISHED |
| Assigner | Wordfence |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-05-20 02:16:38 UTC |
| Updated | 2026-05-20 13:54:54 UTC |
| Description | The 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. |
Risk And Classification
Primary CVSS: v3.1 9.8 CRITICAL from [email protected]
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS: 0.003540000 probability, percentile 0.578640000 (date 2026-05-27)
Problem Types: CWE-434 | CWE-434 CWE-434 Unrestricted Upload of File with Dangerous Type
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Primary | 9.8 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | CNA | DECLARED | 9.8 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
HighIntegrity
HighAvailability
HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Prosolution | ProSolution WP Client | affected 2.0.0 semver | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| plugins.trac.wordpress.org/browser/prosolution-wp-client/trunk/public/class-prosolwpclie... | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/prosolution-wp-client/trunk/includes/UploadHandler.php | [email protected] | plugins.trac.wordpress.org | |
| www.wordfence.com/threat-intel/vulnerabilities/id/0b870d35-7e10-4fb5-8c3b-2bf29... | [email protected] | www.wordfence.com | |
| plugins.trac.wordpress.org/browser/prosolution-wp-client/trunk/includes/UploadHandler.php | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/prosolution-wp-client/tags/2.0.0/includes/UploadHandl... | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/prosolution-wp-client/tags/2.0.0/includes/UploadHandl... | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/prosolution-wp-client/tags/2.0.0/public/class-prosolw... | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/prosolution-wp-client/trunk/public/class-prosolwpclie... | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/prosolution-wp-client/tags/2.0.0/public/class-prosolw... | [email protected] | plugins.trac.wordpress.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Achmad Zaenuri Dahlan Putra (en)
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2026-05-19T12:03:25.000Z | Disclosed |
There are currently no legacy QID mappings associated with this CVE.