CVE-2025-67570: WPForms Google Sheet Connector Bypass

CVE-2025-67570 Overview

CVE-2025-67570 is a missing authorization vulnerability in the WesternDeal WPForms Google Sheet Connector plugin (gsheetconnector-wpforms) for WordPress. The flaw affects all plugin versions up to and including 4.0.0. Attackers can exploit incorrectly configured access control security levels to interact with plugin functionality without proper authorization checks. The vulnerability is categorized under [CWE-862] Missing Authorization. Because the attack vector is network-based and requires no authentication or user interaction, remote attackers can reach the vulnerable endpoints directly. Successful exploitation results in a limited integrity impact on affected WordPress sites.

Critical Impact
Unauthenticated attackers can invoke plugin functions that should be restricted to privileged users, leading to unauthorized modifications to plugin-managed data.

Affected Products

WPForms Google Sheet Connector plugin (gsheetconnector-wpforms) versions up to and including 4.0.0
WordPress sites running the vulnerable plugin version
Environments integrating WPForms submissions with Google Sheets via this connector

Discovery Timeline

2025-12-09 - CVE-2025-67570 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-67570

Vulnerability Analysis

The vulnerability stems from the plugin failing to enforce capability or nonce checks on one or more of its action handlers. Under WordPress security guidelines, plugin endpoints that modify configuration or trigger backend operations must validate the caller's role using current_user_can() and verify request authenticity with check_admin_referer() or wp_verify_nonce(). When these checks are missing or misconfigured, requests from unauthenticated visitors are treated as legitimate.

The Patchstack Vulnerability Advisory classifies this as a broken access control issue. The impact is limited to integrity, meaning attackers can alter plugin state or trigger actions but cannot directly read confidential data or take the site offline through this specific flaw.

Root Cause

The root cause is an incorrectly configured authorization layer within one or more AJAX or admin-post handlers registered by the plugin. Handlers accept requests without validating whether the caller holds an appropriate WordPress capability such as manage_options.

Attack Vector

A remote attacker sends a crafted HTTP request to a vulnerable plugin endpoint on the target WordPress site. Because no privileges are required, exploitation can be automated across large numbers of sites running the plugin. The attacker manipulates plugin behavior tied to the Google Sheets integration without a valid session.

No verified public exploit code is available for this issue. Refer to the Patchstack advisory for further technical detail.

Detection Methods for CVE-2025-67570

Indicators of Compromise

Unexpected HTTP POST requests to admin-ajax.php or admin-post.php referencing gsheetconnector-wpforms actions from unauthenticated sources
Unrecognized changes to WPForms-to-Google-Sheets mappings or plugin configuration entries in wp_options
Access log entries showing plugin endpoint hits without a preceding authenticated session cookie

Detection Strategies

Audit WordPress access logs for requests targeting gsheetconnector-wpforms action names originating from external IPs
Compare current plugin configuration against a known-good baseline to identify unauthorized modifications
Deploy a Web Application Firewall (WAF) rule that requires an authenticated session cookie for plugin admin actions

Monitoring Recommendations

Enable WordPress activity logging to capture option changes and plugin setting modifications
Alert on anomalous spikes in requests to plugin-specific AJAX actions
Monitor outbound traffic from the WordPress host to Google Sheets APIs for unexpected activity

How to Mitigate CVE-2025-67570

Immediate Actions Required

Update the WPForms Google Sheet Connector plugin to a version later than 4.0.0 once a patched release is available from the vendor
If no patched version exists, deactivate and remove the plugin until a fix is released
Review WPForms and Google Sheets integration configuration for unauthorized changes

Patch Information

At the time of publication, the Patchstack advisory lists all versions through 4.0.0 as affected. Administrators should monitor the plugin's WordPress.org page and vendor channels for the next release addressing broken access control.

Workarounds

Restrict access to wp-admin/admin-ajax.php and wp-admin/admin-post.php through a WAF policy that enforces authentication for plugin-specific actions
Apply IP allowlisting to the WordPress admin interface where operationally feasible
Rotate any Google Sheets API credentials configured in the plugin if unauthorized activity is suspected

bash

# Configuration example: temporary WAF rule concept to block unauthenticated access
# to gsheetconnector-wpforms actions until a patch is applied
SecRule REQUEST_URI "@rx /wp-admin/admin-(ajax|post)\.php" \
    "chain,deny,status:403,id:1067570,msg:'Block unauth gsheetconnector-wpforms actions'"
    SecRule ARGS:action "@rx gsheetconnector" \
        "chain"
        SecRule &REQUEST_COOKIES:/wordpress_logged_in_/ "@eq 0"