CVE-2025-30565: Banner Manager CSRF Vulnerability

CVE-2025-30565 Overview

CVE-2025-30565 is a Cross-Site Request Forgery (CSRF) vulnerability in the karrikas banner-manager WordPress plugin that enables attackers to perform Stored Cross-Site Scripting (XSS) attacks. The vulnerability allows malicious actors to trick authenticated administrators into executing unauthorized actions, ultimately injecting persistent malicious scripts into the WordPress site.

Critical Impact

Attackers can chain CSRF with Stored XSS to compromise WordPress administrator sessions, steal credentials, and potentially gain full control of affected websites.

Affected Products

• karrikas banner-manager WordPress plugin version 16.04.19 and earlier
• WordPress sites running vulnerable versions of the banner-manager plugin

Discovery Timeline

• 2025-03-24 - CVE CVE-2025-30565 published to NVD
• 2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-30565

Vulnerability Analysis

This vulnerability represents a dangerous combination of two web application security flaws: Cross-Site Request Forgery (CSRF) and Stored Cross-Site Scripting (XSS). The banner-manager plugin fails to implement proper CSRF token validation on critical administrative endpoints, allowing attackers to craft malicious requests that are executed in the context of an authenticated administrator's session.

Once the CSRF protection is bypassed, the attacker can inject malicious JavaScript code that gets stored in the database and rendered to all users visiting pages where banners are displayed. This creates a persistent attack vector that can affect multiple users over an extended period.

The vulnerability requires user interaction (an administrator must visit a malicious page or click a crafted link), but once triggered, the stored XSS payload persists and executes without further user action. The scope is changed, meaning the vulnerability in one component (the plugin) can impact resources beyond its security scope (the entire WordPress site and its visitors).

Root Cause

The root cause of this vulnerability is the absence of CSRF token verification in the banner-manager plugin's administrative functions. WordPress provides built-in nonce verification mechanisms through functions like wp_nonce_field() and wp_verify_nonce(), but the plugin fails to implement these security controls. Additionally, the plugin does not properly sanitize or escape user-supplied input before storing it in the database, enabling the Stored XSS component of this attack chain.

Attack Vector

The attack exploits the network-accessible administrative interface of WordPress sites running the vulnerable plugin. An attacker constructs a malicious web page containing a hidden form or JavaScript that automatically submits a crafted request to the victim's WordPress admin panel. When an authenticated administrator visits the attacker's page, their browser unknowingly sends the malicious request to their own WordPress site, injecting XSS payloads into banner content.

The attack flow involves: (1) attacker creates a malicious page with a forged request targeting the banner-manager plugin, (2) administrator is lured to visit the attacker's page while logged into WordPress, (3) the forged request is executed with the administrator's session cookies, (4) malicious JavaScript is stored in the banner content, and (5) all subsequent visitors to pages displaying the compromised banner execute the malicious script.

For detailed technical information about this vulnerability, refer to the Patchstack WordPress Vulnerability Report.

Detection Methods for CVE-2025-30565

Indicators of Compromise

• Unexpected or suspicious JavaScript code present in banner content within the WordPress database
• Unusual administrator activity logs showing banner modifications without corresponding legitimate admin sessions
• Reports of browser warnings or unexpected script execution on pages displaying banners
• Network logs showing referrer headers from unknown external domains during banner update requests

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block requests lacking proper CSRF tokens to plugin endpoints
• Monitor WordPress audit logs for banner content modifications, especially those occurring shortly after external page visits
• Deploy Content Security Policy (CSP) headers to detect and report unauthorized inline script execution
• Use file integrity monitoring to detect unexpected changes to banner-related database entries

Monitoring Recommendations

• Enable WordPress debug logging and regularly review for suspicious plugin activity
• Configure real-time alerts for administrative actions performed on the banner-manager plugin
• Implement browser-based XSS detection mechanisms such as CSP report-uri directives
• Regularly scan stored banner content for potentially malicious script patterns

How to Mitigate CVE-2025-30565

Immediate Actions Required

• Audit all existing banner content in the WordPress database for injected malicious scripts
• Consider temporarily disabling the banner-manager plugin until a patched version is available or alternative security measures are implemented
• Implement additional WordPress security plugins that provide CSRF protection at the application level
• Review administrator account activity logs for any signs of unauthorized banner modifications

Patch Information

No official patch information is currently available from the vendor. Organizations should monitor the Patchstack vulnerability database for updates on remediation guidance. Until a patch is released, implementing the workarounds below is strongly recommended.

Workarounds

• Deploy a Web Application Firewall (WAF) with rules to enforce CSRF token validation on plugin administrative endpoints
• Restrict access to WordPress admin panel by IP address to limit the attack surface
• Implement Content Security Policy headers with strict script-src directives to mitigate XSS execution
• Consider replacing the banner-manager plugin with an alternative that implements proper CSRF and XSS protections

# Example: Add Content Security Policy headers in Apache .htaccess
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline';"

# Example: Restrict wp-admin access by IP in .htaccess
<Files wp-login.php>
    Order Deny,Allow
    Deny from all
    Allow from YOUR_TRUSTED_IP
</Files>