CVE-2026-19050: ProSolution WP Client SSRF Vulnerability

CVE-2026-19050 Overview

CVE-2026-19050 is a Server-Side Request Forgery (SSRF) vulnerability in the ProSolution WP Client WordPress plugin before version 2.0.9. The plugin fails to validate a user-supplied URL and does not check the capability or nonce of the requester before performing a server-side HTTP request. Any authenticated user, including low-privileged subscribers, can force the site to issue arbitrary requests to internal hosts and services. Attackers control the HTTP method, headers, and body of the outbound request, enabling interaction with internal endpoints not reachable from the public internet.

Critical Impact
Authenticated subscribers can pivot the vulnerable WordPress site into internal networks, reaching cloud metadata services, internal APIs, and unauthenticated admin panels.

Affected Products

ProSolution WP Client WordPress plugin versions before 2.0.9
WordPress installations with the affected plugin activated
Any authenticated user role including subscriber-level accounts

Discovery Timeline

2026-08-12 - CVE-2026-19050 published to NVD
2026-08-12 - Last updated in NVD database

Technical Details for CVE-2026-19050

Vulnerability Analysis

The vulnerability is classified as Server-Side Request Forgery under [CWE-918]. The plugin exposes a server-side HTTP request handler that accepts an attacker-controlled URL parameter. The handler performs three critical failures: it omits capability checks, skips nonce verification, and does not validate or restrict the target URL.

Because the request originates from the WordPress server, it bypasses network segmentation that would otherwise block external clients. Attackers can reach 127.0.0.1, private RFC1918 ranges, and cloud provider metadata endpoints such as 169.254.169.254. The ability to set arbitrary methods, headers, and body content extends the impact beyond simple GET-based reconnaissance to state-changing interactions with internal services.

Root Cause

The root cause is missing authorization and missing input validation on a plugin AJAX or REST endpoint that proxies HTTP requests. WordPress capability checks (current_user_can()) and nonce verification (check_ajax_referer()) are absent from the handler. No allowlist or scheme filtering constrains the destination URL, permitting arbitrary internal and external targets.

Attack Vector

Exploitation requires only a valid authenticated session at the lowest privilege level. An attacker registers or compromises a subscriber account, then issues a crafted request to the vulnerable endpoint with a URL pointing to an internal target. The plugin performs the request server-side and may return the response content to the attacker. This enables internal port scanning, metadata credential theft on cloud-hosted instances, and interaction with internal administration interfaces.

See the WPScan Vulnerability Report for additional technical details.

Detection Methods for CVE-2026-19050

Indicators of Compromise

Outbound HTTP requests from the WordPress server to internal IP ranges (127.0.0.0/8, 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16)
Requests from the WordPress server to cloud metadata endpoints such as 169.254.169.254
Unusual authenticated AJAX or REST traffic from subscriber-level accounts targeting ProSolution WP Client endpoints
Web server access logs showing repeated invocations of plugin endpoints with URL parameters

Detection Strategies

Monitor web server logs for POST requests to ProSolution WP Client AJAX handlers containing URL parameters with internal or loopback addresses
Correlate PHP wp_remote_* function calls with the originating authenticated user role to identify subscriber-initiated outbound requests
Alert on any egress traffic from WordPress hosts to cloud instance metadata service IP addresses

Monitoring Recommendations

Enable WordPress audit logging for plugin AJAX and REST endpoint invocations tied to user IDs
Deploy egress filtering telemetry to capture destination IP, port, and method for all outbound requests from web application servers
Track subscriber account registrations followed by unusual API activity within short time windows

How to Mitigate CVE-2026-19050

Immediate Actions Required

Update the ProSolution WP Client plugin to version 2.0.9 or later immediately
Audit existing subscriber and low-privilege accounts for unauthorized registrations
Review outbound request logs from the WordPress server for signs of prior SSRF exploitation targeting internal services
Rotate any credentials accessible via cloud metadata services if the site runs on AWS, Azure, or GCP with instance role attachments

Patch Information

The vendor addressed this vulnerability in ProSolution WP Client version 2.0.9. Administrators should upgrade through the WordPress plugin dashboard or by replacing the plugin files with the patched release. Consult the WPScan Vulnerability Report for advisory details.

Workarounds

Deactivate the ProSolution WP Client plugin until the patched version can be deployed
Disable open user registration or restrict the default role to prevent unauthenticated subscriber creation
Configure a web application firewall rule to block requests to the vulnerable plugin endpoints containing internal IP patterns in URL parameters
Apply host-level egress filtering to prevent the WordPress server from reaching internal management networks and cloud metadata endpoints

bash

# Configuration example: block egress to cloud metadata service from WordPress host
iptables -A OUTPUT -d 169.254.169.254 -j DROP
iptables -A OUTPUT -d 127.0.0.0/8 -p tcp --dport 1:65535 -m owner --uid-owner www-data -j DROP