CVE-2025-30577: Browser Address Bar Color CSRF Vulnerability

CVE-2025-30577 Overview

CVE-2025-30577 is a Cross-Site Request Forgery (CSRF) vulnerability in the WordPress Browser Address Bar Color plugin (developed by mendibass) that can be leveraged to achieve Stored Cross-Site Scripting (XSS). This vulnerability allows attackers to trick authenticated administrators into executing malicious actions, ultimately enabling persistent script injection into the WordPress site.

Critical Impact

Attackers can chain CSRF with Stored XSS to persistently inject malicious scripts into affected WordPress sites, potentially compromising administrator sessions and website integrity.

Affected Products

• Browser Address Bar Color WordPress Plugin versions up to and including 3.3
• WordPress sites running the vulnerable plugin versions

Discovery Timeline

• 2025-03-24 - CVE-2025-30577 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-30577

Vulnerability Analysis

This vulnerability represents a chained attack scenario where a Cross-Site Request Forgery weakness enables Stored Cross-Site Scripting. The Browser Address Bar Color plugin, designed to customize the mobile browser address bar color on WordPress sites, fails to implement proper CSRF protections on its settings pages. This missing validation allows attackers to craft malicious requests that, when executed by an authenticated administrator, can inject persistent JavaScript payloads into the plugin's stored settings.

The stored nature of this XSS vulnerability means that once the malicious script is injected through the CSRF attack, it will execute every time the affected page is loaded, potentially impacting all site visitors and administrators.

Root Cause

The root cause of this vulnerability lies in the plugin's failure to implement CSRF token validation (nonce verification) on its administrative settings forms. WordPress provides built-in nonce functions (wp_nonce_field() and wp_verify_nonce()) specifically to prevent CSRF attacks, but the Browser Address Bar Color plugin does not properly utilize these security mechanisms.

Additionally, the plugin lacks proper output encoding and input sanitization for user-controllable settings, allowing the injected content to be rendered as executable JavaScript rather than harmless text.

Attack Vector

The attack requires social engineering to trick an authenticated WordPress administrator into visiting a malicious webpage or clicking a crafted link. The attack flow typically involves:

1. The attacker crafts a malicious HTML page containing a hidden form that targets the vulnerable plugin's settings endpoint
2. When an authenticated administrator visits the attacker's page, the form auto-submits, sending a forged request to update the plugin settings
3. Since no CSRF token validation occurs, the malicious settings (containing XSS payloads) are saved to the database
4. The stored XSS payload executes whenever the affected pages are rendered, allowing session hijacking, privilege escalation, or further site compromise

Due to the nature of this vulnerability (CSRF requiring user interaction to trigger), exploitation in the wild requires targeted social engineering against site administrators.

Detection Methods for CVE-2025-30577

Indicators of Compromise

• Unexpected modifications to Browser Address Bar Color plugin settings
• Unusual JavaScript code or <script> tags stored in plugin configuration options in the WordPress database
• Administrator reports of being redirected to external sites or unexpected popups
• Suspicious entries in web server access logs showing requests to plugin settings endpoints from external referrers

Detection Strategies

• Review the wp_options table for unexpected entries related to the Browser Address Bar Color plugin containing script tags or JavaScript event handlers
• Implement Content Security Policy (CSP) headers to detect and block unauthorized script execution
• Monitor WordPress admin audit logs for settings changes made without corresponding administrator activity
• Scan plugin settings pages for stored XSS patterns using automated security scanning tools

Monitoring Recommendations

• Enable WordPress audit logging to track all plugin configuration changes
• Deploy a Web Application Firewall (WAF) to detect and block XSS payloads in form submissions
• Regularly review WordPress database entries for suspicious content in serialized plugin options
• Monitor for unusual JavaScript execution patterns or external resource loading on administrative pages

How to Mitigate CVE-2025-30577

Immediate Actions Required

• Deactivate and remove the Browser Address Bar Color plugin if it is not critical to site functionality
• Review the WordPress wp_options table for any suspicious entries related to the plugin and sanitize as needed
• Audit site administrator accounts for any unauthorized access or session anomalies
• Consider implementing additional security plugins that provide CSRF protection at the application level
• Ensure all administrators are trained on the risks of clicking unknown links while logged into WordPress

Patch Information

At the time of publication, users should check for updated versions of the Browser Address Bar Color plugin that address this vulnerability. The Patchstack Vulnerability Report provides detailed information about the vulnerability and should be monitored for patch availability announcements.

If no patch is available, site administrators should strongly consider removing the plugin entirely and seeking alternative solutions for address bar color customization.

Workarounds

• Remove or deactivate the Browser Address Bar Color plugin until a patched version is available
• Implement a Web Application Firewall (WAF) rule to block suspicious POST requests to the plugin's settings endpoint
• Restrict administrative access to trusted IP addresses only to reduce the attack surface
• Use browser extensions or security policies that prevent auto-form submission on external sites
• Add custom CSRF validation at the server level through additional security plugins like Wordfence or Sucuri

# WordPress CLI command to deactivate the vulnerable plugin
wp plugin deactivate browser-address-bar-color

# Check for suspicious entries in wp_options (adjust table prefix as needed)
wp db query "SELECT option_name, option_value FROM wp_options WHERE option_name LIKE '%browser_address%' AND option_value LIKE '%script%'"

# If suspicious entries found, delete the plugin options
wp db query "DELETE FROM wp_options WHERE option_name LIKE '%browser_address_bar%'"