CVE-2025-7686: WordPress WP伪春菜 Plugin CSRF Vulnerability

CVE-2025-7686 Overview

CVE-2025-7686 is a Cross-Site Request Forgery (CSRF) vulnerability affecting the weichuncai (WP伪春菜) plugin for WordPress. The flaw exists in all versions up to and including 1.5. The root cause is missing or incorrect nonce validation on the sm-options.php page.

Unauthenticated attackers can exploit this flaw to update plugin settings and inject malicious web scripts. Exploitation requires tricking a site administrator into clicking a crafted link or visiting a malicious page. The vulnerability is classified under [CWE-352] Cross-Site Request Forgery.

Critical Impact
Successful exploitation allows attackers to modify plugin configuration and inject stored scripts that execute in the context of the affected WordPress site.

Affected Products

weichuncai (WP伪春菜) WordPress plugin, all versions through 1.5
WordPress sites with the vulnerable plugin activated
Administrator sessions authenticated to the affected WordPress instance

Discovery Timeline

2025-08-16 - CVE-2025-7686 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-7686

Vulnerability Analysis

The weichuncai plugin exposes an administrative settings page implemented in sm-options.php. WordPress plugins are expected to validate a nonce token on any state-changing request using functions such as check_admin_referer() or wp_verify_nonce(). The weichuncai plugin either omits this validation entirely or implements it incorrectly.

Without nonce enforcement, the plugin cannot distinguish between a legitimate administrator submission and a request forged by an external site. Any authenticated administrator visiting an attacker-controlled page can be forced to submit arbitrary settings updates. Because the settings values are later rendered without adequate output encoding, attackers can plant JavaScript payloads that execute for subsequent visitors.

Root Cause

The defect stems from the absence of proper CSRF token validation on the settings form handler in sm-options.php. WordPress provides a built-in nonce framework precisely to prevent this class of attack. The plugin's failure to validate _wpnonce on POST submissions permits cross-origin form submissions to succeed whenever an administrator is authenticated.

Attack Vector

An attacker crafts an HTML page containing a form that submits to the vulnerable sm-options.php endpoint with attacker-chosen values. The attacker delivers the link through phishing, forum posts, or comment spam. When an authenticated administrator loads the page, the browser silently submits the request with the administrator's session cookies. The plugin accepts the submission, updates configuration, and stores the injected script content for later execution.

The vulnerability manifests through missing nonce validation on the plugin options handler. See the Wordfence Vulnerability Analysis and the WordPress Plugin Source Code for technical details.

Detection Methods for CVE-2025-7686

Indicators of Compromise

Unexpected modifications to weichuncai plugin settings in the WordPress wp_options table
Presence of <script> tags or JavaScript event handlers within stored plugin configuration values
POST requests to sm-options.php originating with external Referer headers or lacking valid nonce parameters
Anomalous outbound requests from visitor browsers to attacker-controlled domains after page load

Detection Strategies

Inspect web server logs for POST requests to /wp-admin/admin.php?page=sm-options where the Referer header points to an untrusted origin
Review the plugin's stored option values for HTML or script content that should not be present in configuration fields
Correlate administrator login sessions with unexpected settings changes recorded in audit logs

Monitoring Recommendations

Enable WordPress activity logging plugins to capture settings changes with user attribution and timestamps
Monitor administrator browser sessions for cross-origin form submissions targeting wp-admin endpoints
Deploy Content Security Policy (CSP) reporting to identify injected script execution on public pages

How to Mitigate CVE-2025-7686

Immediate Actions Required

Deactivate and remove the weichuncai plugin until a patched version is confirmed available
Audit plugin settings and remove any unexpected script content injected into configuration fields
Force password resets for administrator accounts if unauthorized settings changes are identified
Review recently modified files and posts for signs of persistence following successful CSRF exploitation

Patch Information

At the time of the latest NVD update, no fixed version has been identified for the weichuncai plugin. All releases through 1.5 remain vulnerable. Site operators should track the Wordfence Vulnerability Analysis for patch availability updates.

Workarounds

Remove the weichuncai plugin entirely if the functionality is not required
Restrict wp-admin access to trusted IP addresses using web server access controls
Deploy a Web Application Firewall (WAF) rule to block POST requests to sm-options.php that lack a valid WordPress nonce
Train administrators to log out of WordPress sessions before browsing untrusted sites and links

bash

# Example nginx rule to block requests to the vulnerable endpoint
location ~* /wp-content/plugins/weichuncai/ {
    deny all;
    return 403;
}