CVE-2025-22555: Smoothness Slider Shortcode CSRF Flaw

CVE-2025-22555 Overview

CVE-2025-22555 is a Cross-Site Request Forgery (CSRF) vulnerability affecting the Smoothness Slider Shortcode WordPress plugin developed by njshofe. This vulnerability allows attackers to perform unauthorized actions on behalf of authenticated users, which can be chained to achieve Stored Cross-Site Scripting (XSS). The issue exists in all versions of the plugin from its initial release through version 1.2.2.

Critical Impact

Attackers can exploit this CSRF vulnerability to perform unauthorized actions within the WordPress admin panel, potentially leading to stored XSS attacks that execute malicious scripts in the context of other users' sessions.

Affected Products

• Smoothness Slider Shortcode WordPress Plugin version 1.2.2 and earlier
• All WordPress installations using the vulnerable plugin versions
• WordPress sites with administrator users who may interact with malicious links

Discovery Timeline

• 2025-01-07 - CVE-2025-22555 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-22555

Vulnerability Analysis

This vulnerability is classified under CWE-352 (Cross-Site Request Forgery). The Smoothness Slider Shortcode plugin fails to properly implement anti-CSRF tokens in its administrative functions. When an authenticated administrator visits a maliciously crafted page, the attacker can force the admin's browser to submit requests to the WordPress backend that modify plugin settings or inject malicious content.

The vulnerability is particularly concerning because it can be chained with Stored XSS. An attacker can craft a CSRF payload that injects malicious JavaScript code into the slider settings, which then executes whenever the compromised slider content is rendered on the frontend or in the admin panel.

Root Cause

The root cause of this vulnerability is the absence of proper nonce verification in the plugin's form submission handlers. WordPress provides the wp_nonce_field() and wp_verify_nonce() functions specifically to prevent CSRF attacks, but the Smoothness Slider Shortcode plugin does not implement these security controls when processing administrative requests. This allows any authenticated request from the admin's browser to be accepted without verifying that the request originated from a legitimate form within the WordPress admin interface.

Attack Vector

The attack requires social engineering to trick an authenticated WordPress administrator into visiting a malicious webpage or clicking a crafted link. The attacker's page contains hidden form elements or JavaScript that automatically submits a request to the vulnerable plugin endpoint. Since the admin's browser includes their authentication cookies with the request, the WordPress site processes it as a legitimate administrative action.

The attack flow typically follows this pattern:

1. Attacker identifies a WordPress site using the vulnerable Smoothness Slider Shortcode plugin
2. Attacker crafts a malicious HTML page containing a hidden form that targets the plugin's settings endpoint
3. Attacker delivers the malicious page to a site administrator via phishing or other social engineering techniques
4. When the admin visits the malicious page while logged into WordPress, the CSRF payload executes
5. The plugin settings are modified to include malicious JavaScript (achieving Stored XSS)
6. Any user viewing pages with the compromised slider will have the malicious script executed in their browser

For detailed technical information, see the Patchstack WordPress Vulnerability Report.

Detection Methods for CVE-2025-22555

Indicators of Compromise

• Unexpected modifications to Smoothness Slider Shortcode plugin settings without administrator action
• Presence of JavaScript code or HTML tags in slider configuration fields where only plain text should exist
• Browser console errors or unexpected script execution when viewing pages containing slider shortcodes
• Web server logs showing POST requests to plugin endpoints from external referrers

Detection Strategies

• Monitor WordPress admin activity logs for changes to plugin settings that administrators did not initiate
• Implement Content Security Policy (CSP) headers to detect and block unauthorized inline script execution
• Use a Web Application Firewall (WAF) to detect and block requests with suspicious external referrers targeting admin endpoints
• Regularly audit plugin database entries for unexpected JavaScript or HTML content

Monitoring Recommendations

• Enable detailed logging for all WordPress administrative actions, particularly plugin configuration changes
• Configure alerts for any modifications to the Smoothness Slider Shortcode settings
• Monitor referrer headers in web server logs for requests to WordPress admin endpoints
• Implement real-time monitoring for new script injections on frontend pages

How to Mitigate CVE-2025-22555

Immediate Actions Required

• Deactivate and remove the Smoothness Slider Shortcode plugin from affected WordPress installations until a patched version is available
• Audit existing slider configurations for any signs of injected malicious content
• Review WordPress admin activity logs for unauthorized changes
• Educate administrators about the risks of clicking unknown links while logged into WordPress

Patch Information

As of the last update to this vulnerability record, there is no official patch available from the plugin developer. Website administrators should monitor the Patchstack WordPress Vulnerability Report for updates on a security fix. Consider replacing this plugin with an actively maintained alternative that implements proper CSRF protections.

Workarounds

• Remove or deactivate the Smoothness Slider Shortcode plugin until a security update is released
• Implement a Web Application Firewall (WAF) rule to block POST requests to the plugin's admin endpoints from external referrers
• Use browser security extensions that warn administrators before submitting forms to different domains
• Limit administrator sessions to trusted networks and avoid browsing external sites while logged into WordPress

# WordPress CLI command to deactivate the vulnerable plugin
wp plugin deactivate smoothness-slider-shortcode

# Verify the plugin is deactivated
wp plugin status smoothness-slider-shortcode

# Optionally remove the plugin entirely
wp plugin delete smoothness-slider-shortcode