CVE-2025-30772: WPC Smart Upsell Funnel Privilege Escalation

CVE-2025-30772 Overview

CVE-2025-30772 is a missing authorization vulnerability in the WPClever WPC Smart Upsell Funnel for WooCommerce plugin. The flaw affects all versions up to and including 3.0.4. It allows an authenticated attacker with low-level privileges to update arbitrary WordPress options, leading to full privilege escalation on the affected site. The issue is tracked under CWE-862: Missing Authorization and was published to the National Vulnerability Database (NVD) on March 27, 2025.

Critical Impact
An authenticated low-privileged user can modify arbitrary site options to escalate privileges to administrator, resulting in full compromise of confidentiality, integrity, and availability of the WooCommerce store.

Affected Products

WPClever WPC Smart Upsell Funnel for WooCommerce plugin
All versions from initial release through 3.0.4
WordPress sites running WooCommerce with this plugin installed

Discovery Timeline

2025-03-27 - CVE-2025-30772 published to NVD
2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-30772

Vulnerability Analysis

The vulnerability stems from missing authorization checks in the WPC Smart Upsell Funnel for WooCommerce plugin. The plugin exposes functionality that updates WordPress options without verifying whether the requesting user has the required capabilities. An authenticated user with minimal privileges, such as a subscriber or customer, can invoke this functionality and modify sensitive site settings.

WordPress options control critical site behavior, including the default user role assigned at registration and whether open registration is enabled. By tampering with these values, an attacker can grant themselves administrative privileges. The vulnerability requires network access and authentication but no user interaction.

The scope of impact is broad because WordPress option updates can affect any plugin or theme that reads configuration from the options table. This makes the flaw a viable launching point for full site takeover and downstream attacks against site visitors.

Root Cause

The root cause is the absence of capability checks and nonce validation on plugin endpoints that perform option updates. The plugin trusts authenticated requests without confirming that the calling user holds the manage_options capability or an equivalent privilege. This pattern is classified as CWE-862: Missing Authorization.

Attack Vector

An attacker first registers or compromises a low-privileged account on the target WordPress site. The attacker then sends a crafted request to the vulnerable plugin endpoint, supplying option name and value parameters that grant administrative access. After the option update succeeds, the attacker logs out and back in, or registers a new account, to inherit the elevated role and gain administrator access. Refer to the Patchstack Vulnerability Advisory for additional technical context.

Detection Methods for CVE-2025-30772

Indicators of Compromise

Unexpected changes to the default_role or users_can_register options in the WordPress wp_options table.
New administrator accounts created shortly after low-privileged account registration or login activity.
POST requests from authenticated non-admin users to plugin endpoints under paths containing wpc-smart-upsell-funnel or wpc_upsell.
Modifications to active plugins, theme, or siteurl options without a corresponding administrator session.

Detection Strategies

Review WordPress audit logs for option update events originating from users without administrator capabilities.
Correlate web server logs against the WPC Smart Upsell Funnel AJAX or REST endpoints to identify requests from low-privileged sessions.
Hash and compare the contents of wp_options against a known-good baseline to detect tampering.
Inspect the wp_usermeta table for unexpected role assignments such as wp_capabilities set to administrator on recently created accounts.

Monitoring Recommendations

Enable a WordPress security plugin or external audit logger to record all option changes with user attribution.
Forward web access logs and WordPress event logs to a centralized SIEM for correlation across sessions.
Alert on any privilege change events affecting the wp_users and wp_usermeta tables outside of approved administrative workflows.

How to Mitigate CVE-2025-30772

Immediate Actions Required

Update the WPC Smart Upsell Funnel for WooCommerce plugin to a version later than 3.0.4 as soon as the vendor publishes a fixed release.
Audit all WordPress user accounts and remove any unrecognized administrators or recently elevated users.
Disable open user registration on the site by setting users_can_register to 0 until the plugin is patched.
Rotate credentials for all administrator and editor accounts and force a global password reset.

Patch Information

The Patchstack advisory tracks the issue against WPC Smart Upsell Funnel for WooCommerce versions through 3.0.4. Site operators should monitor the Patchstack Vulnerability Advisory and the official WordPress plugin repository for the patched release and apply it immediately upon availability.

Workarounds

Deactivate and remove the WPC Smart Upsell Funnel for WooCommerce plugin until a patched version is released.
Restrict access to wp-admin/admin-ajax.php and REST API endpoints associated with the plugin using a web application firewall rule.
Apply virtual patching rules from a WordPress firewall provider to block arbitrary option update requests from non-administrative users.
Enforce the principle of least privilege by limiting which roles can register and authenticate to the site.

bash

# Configuration example: disable open registration and lock default role via wp-cli
wp option update users_can_register 0
wp option update default_role subscriber