CVE-2026-6555
CWE-434Published: May 20, 2026· Updated: May 20, 2026
Official 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 Analysis
A critical arbitrary file upload vulnerability exists in the ProSolution WP Client plugin for WordPress. Unauthenticated attackers can bypass validation to upload malicious PHP files, leading to remote code execution. The high CVSS score of 9.8 highlights its severity.
There is no known public exploit for this vulnerability at this time. The network attack vector and low attack complexity suggest it is remotely exploitable.
It is recommended to update the ProSolution WP Client plugin to a version beyond 2.0.0 to mitigate this risk.
Technical Analysis
CVE-2026-6555 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.
CVSS v3.1 Vector Breakdown
Affected Vendors & Products
Exploit & PoC Resources
All References (9)
Quick Facts
Related CVEs (CWE-434)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2026-6555 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts