CVE-2025-26580: Social Share Buttons CSRF Vulnerability

CVE-2025-26580 Overview

CVE-2025-26580 is a Cross-Site Request Forgery (CSRF) vulnerability in the WordPress plugin "Page/Post Specific Social Share Buttons" by Complete SEO that enables Stored Cross-Site Scripting (XSS) attacks. This chained vulnerability allows unauthenticated attackers to trick authenticated administrators into submitting malicious requests, which then persist malicious scripts in the WordPress database for execution against future visitors.

Critical Impact
Attackers can chain CSRF with Stored XSS to persistently compromise WordPress sites, steal administrator credentials, inject malicious content, and potentially achieve full site takeover without direct authentication.

Affected Products

Page/Post Specific Social Share Buttons plugin version 2.1 and earlier
WordPress installations using the pagepost-specific-social-share-buttons plugin
All WordPress versions compatible with the affected plugin versions

Discovery Timeline

2025-02-13 - CVE-2025-26580 published to NVD
2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-26580

Vulnerability Analysis

This vulnerability combines two distinct attack techniques into a potent exploitation chain. The CSRF component allows attackers to forge requests on behalf of authenticated WordPress administrators who visit a malicious page. Because the plugin fails to implement proper nonce verification or origin validation on form submissions, the attacker-controlled request is processed as if it originated from a legitimate administrator session.

The second stage of the attack leverages insufficient input sanitization in the plugin's settings or content handling. When the forged request includes malicious JavaScript payloads, these scripts are stored in the WordPress database without proper encoding or filtering. Subsequent visitors to affected pages—including other administrators—execute this stored malicious code in their browsers.

The network-based attack vector with required user interaction reflects the CSRF component: an administrator must be tricked into visiting an attacker-controlled page while authenticated to the target WordPress site. The scope change indicates that the XSS payload can affect resources beyond the vulnerable plugin's security context, potentially compromising the entire WordPress installation.

Root Cause

The root cause of CVE-2025-26580 stems from two critical security oversights in the plugin's code:

Missing CSRF Protection: The plugin does not implement WordPress nonce verification (wp_verify_nonce()) on administrative form submissions, allowing attackers to forge cross-origin requests that are accepted as legitimate.
Insufficient Output Encoding: User-supplied input is stored and rendered without proper sanitization using functions like esc_html(), esc_attr(), or wp_kses(), enabling JavaScript injection that persists across page loads.

These combined deficiencies create a vulnerability chain where the CSRF weakness serves as the entry point for injecting persistent XSS payloads.

Attack Vector

The attack follows a multi-stage exploitation path:

The attacker crafts a malicious HTML page containing a hidden form that targets the vulnerable plugin's settings endpoint
The form includes malicious JavaScript in fields that will be stored by the plugin
The attacker tricks a WordPress administrator into visiting this malicious page (via phishing, social engineering, or compromised websites)
The administrator's browser automatically submits the forged request to their WordPress site
The plugin processes the request and stores the malicious script in the database
When any user visits a page displaying the affected social share buttons, the stored XSS payload executes

The attack can be used to steal session cookies, redirect users to phishing sites, inject cryptocurrency miners, deface website content, or create rogue administrator accounts for persistent access.

Detection Methods for CVE-2025-26580

Indicators of Compromise

Unexpected or unauthorized changes to social share button plugin settings
JavaScript code or <script> tags appearing in plugin configuration stored in wp_options table
Unusual administrator activity or session access from unfamiliar IP addresses
Reports of unexpected redirects, pop-ups, or browser warnings from site visitors

Detection Strategies

Monitor WordPress audit logs for configuration changes to the pagepost-specific-social-share-buttons plugin
Implement Content Security Policy (CSP) headers to detect and block inline script execution
Use web application firewalls (WAF) to detect XSS payloads in POST requests to plugin endpoints
Regularly scan database content for suspicious JavaScript patterns using security plugins

Monitoring Recommendations

Enable WordPress activity logging to track all administrative actions and plugin configuration changes
Configure server-side logging to capture POST requests to /wp-admin/ endpoints related to plugin settings
Deploy browser-based XSS monitoring solutions to detect client-side script injection attempts
Set up alerts for any modifications to the wp_options table entries associated with social share functionality

How to Mitigate CVE-2025-26580

Immediate Actions Required

Deactivate and remove the Page/Post Specific Social Share Buttons plugin if running version 2.1 or earlier
Review the wp_options database table for any suspicious entries related to the plugin
Audit recent administrator activity logs for unauthorized configuration changes
Consider resetting administrator passwords if compromise is suspected
Implement a Web Application Firewall with CSRF and XSS protection rules

Patch Information

As of the published data, no patched version has been confirmed. Site administrators should consult the Patchstack Vulnerability Report for the latest remediation guidance and check for plugin updates in the WordPress repository. If no secure version is available, consider migrating to an alternative social sharing plugin that maintains active security updates.

Workarounds

Disable the plugin entirely until a security patch is released
Implement server-level CSRF protection using web server modules or WAF rules
Add Content-Security-Policy headers to restrict inline script execution: Content-Security-Policy: script-src 'self'
Restrict administrative access to trusted IP addresses using .htaccess or firewall rules
Use browser extensions or policies that block cross-site request submissions

bash

# Apache .htaccess example to restrict admin access by IP
<Files wp-login.php>
    Order Deny,Allow
    Deny from all
    Allow from 192.168.1.0/24
    Allow from YOUR.TRUSTED.IP.ADDRESS
</Files>

# Add CSP header to mitigate XSS impact
<IfModule mod_headers.c>
    Header set Content-Security-Policy "script-src 'self'; object-src 'none';"
</IfModule>