CVE-2026-6555: ProSolution WP Client <= 2.0.0 - Unauthenticated Arbitrary File Upload via 'files'
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.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-6555?
The severity of CVE-2026-6555 is critical, with a CVSS score of 9.8.
How do I fix CVE-2026-6555?
To fix CVE-2026-6555, update the ProSolution WP Client plugin to version 2.0.1 or later.
What types of files can be uploaded through CVE-2026-6555?
CVE-2026-6555 allows for arbitrary file uploads, which means any type of file can potentially be uploaded due to insufficient validation.
What impact does CVE-2026-6555 have on my WordPress site?
CVE-2026-6555 can lead to malicious file uploads that could compromise the security of your WordPress site, allowing attackers to execute arbitrary code.
Is authentication required to exploit CVE-2026-6555?
No, CVE-2026-6555 can be exploited without authentication, making it particularly dangerous.