What is the CVSS score of EUVD-2026-20531?

EUVD-2026-20531 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Which versions of WordPress are affected by EUVD-2026-20531?

ProSolution WP Client plugin versions 1.9.9 and earlier contain a critical unauthenticated file upload vulnerability (CVSS 9.8) that allows attackers to execute arbitrary code on WordPress servers…

How to fix or mitigate EUVD-2026-20531?

Within 24 hours: Immediately disable and deactivate ProSolution WP Client plugin on all WordPress installations; audit server logs for suspicious file uploads to wp-content/uploads and plugin directories since plugin deployment. Within 7 days: Remove the plugin entirely and replace with alternative functionality; scan all uploaded files for webshells or malicious executables; review WordPress user accounts for unauthorized administrative access created during potential exploitation window. Within 30 days: Implement Web Application Firewall (WAF) rules blocking executable file uploads; deploy file integrity monitoring on upload directories; conduct full WordPress security audit and upgrade all plugins to latest patched versions.

WordPress EUVD-2026-20531

| CVE-2026-2942 CRITICAL

Unrestricted Upload of File with Dangerous Type (CWE-434)

2026-04-08 Wordfence

GHSA-58qw-hm39-96q8

RCE WordPress File Upload

9.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.8 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Re-analysis Queued

Apr 24, 2026 - 18:07 vuln.today

cvss_changed

EUVD ID Assigned

Apr 08, 2026 - 19:31 euvd

EUVD-2026-20531

Analysis Generated

Apr 08, 2026 - 19:31 vuln.today

CVE Published

Apr 08, 2026 - 17:25 nvd

CRITICAL 9.8

DescriptionCVE.org

The ProSolution WP Client plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the 'proSol_fileUploadProcess' function in all versions up to, and including, 1.9.9. This makes it possible for unauthenticated attackers to upload arbitrary files on the affected site's server which may make remote code execution possible.

AnalysisAI

Unauthenticated arbitrary file upload in ProSolution WP Client plugin (≤1.9.9) enables attackers to upload executable files without validation via the 'proSol_fileUploadProcess' function, leading to remote code execution on WordPress servers. Critical severity (CVSS 9.8) with network-accessible attack vector requiring no authentication or user interaction. No public exploit identified at time of analysis.

Technical ContextAI

Missing file type validation in proSol_fileUploadProcess function (class-prosolwpclient-public.php line 993) allows bypass of content-type restrictions. CWE-434 unrestricted file upload enables direct write of PHP webshells or malicious executables to server filesystem, exploitable via HTTP POST without authentication checks (CVSS PR:N).

RemediationAI

Upgrade to ProSolution WP Client version 1.9.10 or later. Upstream fix available (changeset 3484577); released patched version not independently confirmed at time of analysis. If immediate patching is not feasible, deactivate the plugin entirely until update can be applied, as no workaround exists for unauthenticated file upload vulnerabilities. Review server filesystem for unauthorized uploads (webshells, suspicious PHP files) post-remediation. Consult vendor advisory at https://www.wordfence.com/threat-intel/vulnerabilities/id/3852aef6-42e7-4b71-a1ba-dd41284fd07b and monitor WordPress plugin repository for release announcements.