CVE-2026-6555: CWE-434 Unrestricted Upload of File with Dangerous Type in prosolution ProSolution WP Client
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.
AI Analysis
Technical Summary
CVE-2026-6555 describes an arbitrary file upload vulnerability in the ProSolution WP Client WordPress plugin (<=2.0.0). The vulnerability arises from improper validation logic where only the first file in an upload array is checked for allowed extensions and MIME types. Subsequent files are uploaded without validation to a directory accessible via the web, allowing attackers to upload malicious PHP files. This can lead to remote code execution without authentication, posing a critical security risk.
Potential Impact
Successful exploitation allows unauthenticated attackers to upload arbitrary files, including malicious PHP scripts, to a web-accessible directory. This can result in full remote code execution, compromising the affected web server and potentially the entire hosting environment. The CVSS score of 9.8 reflects the critical severity and the high impact on confidentiality, integrity, and availability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official fix or patch is currently available, users should consider disabling the plugin or restricting file upload capabilities until a fix is released. Monitoring vendor channels for updates is recommended.
CVE-2026-6555: CWE-434 Unrestricted Upload of File with Dangerous Type in prosolution ProSolution WP Client
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.
CVSS v3.1
Score 9.8critical
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-6555 describes an arbitrary file upload vulnerability in the ProSolution WP Client WordPress plugin (<=2.0.0). The vulnerability arises from improper validation logic where only the first file in an upload array is checked for allowed extensions and MIME types. Subsequent files are uploaded without validation to a directory accessible via the web, allowing attackers to upload malicious PHP files. This can lead to remote code execution without authentication, posing a critical security risk.
Potential Impact
Successful exploitation allows unauthenticated attackers to upload arbitrary files, including malicious PHP scripts, to a web-accessible directory. This can result in full remote code execution, compromising the affected web server and potentially the entire hosting environment. The CVSS score of 9.8 reflects the critical severity and the high impact on confidentiality, integrity, and availability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official fix or patch is currently available, users should consider disabling the plugin or restricting file upload capabilities until a fix is released. Monitoring vendor channels for updates is recommended.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Wordfence
- Date Reserved
- 2026-04-17T23:02:07.358Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a0d1a63ba1db473621f7e15
Added to database: 05/20/2026, 02:20:19 UTC
Last enriched: 06/23/2026, 14:16:33 UTC
Last updated: 07/31/2026, 19:23:00 UTC
Views: 102
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