CVE-2026-6555: CWE-434 Unrestricted Upload of File with Dangerous Type in prosolution ProSolution WP Client
The ProSolution WP Client WordPress plugin versions up to 2. 0. 0 contain a critical vulnerability allowing unauthenticated attackers to upload arbitrary files, including malicious PHP scripts. This occurs because only the first file in a multi-file upload is properly validated for extension and MIME type, while subsequent files bypass these checks and are saved in a web-accessible directory. Successful exploitation can lead to remote code execution on the affected server. There is no official patch or remediation level currently confirmed for this vulnerability. The CVSS score of 9. 8 reflects its critical severity and ease of exploitation without authentication.
AI Analysis
Technical Summary
CVE-2026-6555 is an arbitrary file upload vulnerability in the ProSolution WP Client WordPress plugin (up to version 2.0.0). The root cause is a validation logic flaw where only the first file in an upload array undergoes extension and MIME type checks, but all files are uploaded to a web-accessible directory. This allows unauthenticated attackers to upload malicious PHP files by submitting a valid first file followed by a malicious one, potentially leading to remote code execution. The vulnerability is classified under CWE-434 (Unrestricted Upload of File with Dangerous Type) and has a CVSS v3.1 base score of 9.8 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H). No patch or official remediation guidance is currently available.
Potential Impact
An unauthenticated attacker can exploit this vulnerability to upload arbitrary files, including executable PHP scripts, to a web-accessible directory on the target server. This can result in full remote code execution, compromising confidentiality, integrity, and availability of the affected system. The vulnerability requires no privileges or user interaction, making it highly exploitable and dangerous.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, consider disabling or removing the ProSolution WP Client plugin if possible. Implementing web server restrictions to block execution of uploaded files in the plugin's upload directory may reduce risk but is not a complete mitigation.
CVE-2026-6555: CWE-434 Unrestricted Upload of File with Dangerous Type in prosolution ProSolution WP Client
Description
The ProSolution WP Client WordPress plugin versions up to 2. 0. 0 contain a critical vulnerability allowing unauthenticated attackers to upload arbitrary files, including malicious PHP scripts. This occurs because only the first file in a multi-file upload is properly validated for extension and MIME type, while subsequent files bypass these checks and are saved in a web-accessible directory. Successful exploitation can lead to remote code execution on the affected server. There is no official patch or remediation level currently confirmed for this vulnerability. The CVSS score of 9. 8 reflects its critical severity and ease of exploitation without authentication.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-6555 is an arbitrary file upload vulnerability in the ProSolution WP Client WordPress plugin (up to version 2.0.0). The root cause is a validation logic flaw where only the first file in an upload array undergoes extension and MIME type checks, but all files are uploaded to a web-accessible directory. This allows unauthenticated attackers to upload malicious PHP files by submitting a valid first file followed by a malicious one, potentially leading to remote code execution. The vulnerability is classified under CWE-434 (Unrestricted Upload of File with Dangerous Type) and has a CVSS v3.1 base score of 9.8 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H). No patch or official remediation guidance is currently available.
Potential Impact
An unauthenticated attacker can exploit this vulnerability to upload arbitrary files, including executable PHP scripts, to a web-accessible directory on the target server. This can result in full remote code execution, compromising confidentiality, integrity, and availability of the affected system. The vulnerability requires no privileges or user interaction, making it highly exploitable and dangerous.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, consider disabling or removing the ProSolution WP Client plugin if possible. Implementing web server restrictions to block execution of uploaded files in the plugin's upload directory may reduce risk but is not a complete mitigation.
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: 5/20/2026, 2:20:19 AM
Last enriched: 5/20/2026, 2:33:45 AM
Last updated: 5/20/2026, 1:32:56 PM
Views: 11
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