CVE-2026-6555 ProSolution WP Client <= 2.0.0 - Unauthenticated Arbitrary File Upload via 'files'
Unauthenticated attackers can upload malicious PHP files to achieve remote code execution due to insufficient validation of subsequent files in an upload array.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-6555?
CVE-2026-6555 is a critical vulnerability in ProSolution WP Client, published on 20 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-434
Which versions are affected by CVE-2026-6555?
How do I fix CVE-2026-6555?
No fix has been published for CVE-2026-6555 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-6555 being exploited?
There is no known exploitation of CVE-2026-6555 in the wild and no public exploit code.
Sources
Also known as GHSA-pwg9-vp4w-mc97.