CVE-2026-6555 json
ProSolution WP Client <= 2.0.0 - Unauthenticated Arbitrary File Upload via 'files'
published 2026-05-20 5 mo ago modified 2026-07-24 3 mo ago also EUVD-2026-31016
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.0%
- EPSS 1.0% chance of exploitation in 30 days, percentile 62%
- public exploits
- 0
- none known
Summary
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.
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
- Assessed
- 5 mo ago
Exploit prediction
0.98% chance of exploitation in the next 30 days, higher than 62% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
- prosolution ProSolution WP Client
Classification
- Weakness
-
- CWE-434 Unrestricted Upload of File with Dangerous Type
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/0b870d35-7e10-4fb5-8c3b-2bf299d1f3d5?source=cve
- plugins.trac.wordpress.org /browser/prosolution-wp-client/trunk/public/class-prosolwpclient-public.php#L1072
- plugins.trac.wordpress.org /browser/prosolution-wp-client/tags/2.0.0/public/class-prosolwpclient-public.php#L1072
- plugins.trac.wordpress.org /browser/prosolution-wp-client/trunk/includes/UploadHandler.php#L1345
- plugins.trac.wordpress.org /browser/prosolution-wp-client/tags/2.0.0/includes/UploadHandler.php#L1345
- plugins.trac.wordpress.org /browser/prosolution-wp-client/trunk/includes/UploadHandler.php#L384
- plugins.trac.wordpress.org /browser/prosolution-wp-client/tags/2.0.0/includes/UploadHandler.php#L384
- plugins.trac.wordpress.org /browser/prosolution-wp-client/trunk/public/class-prosolwpclient-public.php#L998
- plugins.trac.wordpress.org /browser/prosolution-wp-client/tags/2.0.0/public/class-prosolwpclient-public.php#L998
- plugins.trac.wordpress.org /changeset/3535622/
Sources
- CVE List CVE-2026-6555
- NVD CVE-2026-6555
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.