CVE-2025-6255 Overview
CVE-2025-6255 is a stored Cross-Site Scripting (XSS) vulnerability in the Dynamic AJAX Product Filters for WooCommerce plugin for WordPress. The flaw affects all versions up to and including 1.3.7 and stems from insufficient input sanitization and output escaping on the className parameter. Authenticated attackers with Contributor-level access or higher can inject arbitrary JavaScript that executes when any user views the affected page. The vulnerability is tracked under [CWE-79] and carries a scope-changed impact, meaning injected scripts can affect resources beyond the vulnerable component.
Critical Impact
Authenticated attackers with Contributor privileges can inject persistent JavaScript into WordPress pages, enabling session theft, administrator account takeover, and redirection of site visitors to attacker-controlled infrastructure.
Affected Products
- Dynamic AJAX Product Filters for WooCommerce plugin for WordPress
- All plugin versions up to and including 1.3.7
- WordPress sites using WooCommerce with this filter plugin enabled
Discovery Timeline
- 2025-08-28 - CVE-2025-6255 published to the National Vulnerability Database (NVD)
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-6255
Vulnerability Analysis
The vulnerability resides in the block widget creation logic of the Dynamic AJAX Product Filters plugin. The className parameter accepts user-supplied input that is later rendered into HTML markup without proper sanitization or output escaping. Because the plugin stores this value and echoes it back on page render, the resulting XSS is persistent rather than reflected.
Any authenticated user with Contributor-level access or higher can supply the malicious className value through the block widget interface. Once stored, the payload executes in the browser of every visitor who loads the affected page, including administrators. Successful exploitation can lead to session hijacking, forced administrative actions, malicious redirects, and cryptojacking.
Root Cause
The root cause is a failure to apply WordPress sanitization functions such as sanitize_html_class() on input and escaping functions such as esc_attr() on output. The plugin trusts the raw className value and concatenates it directly into HTML class attributes. Reviewing the referenced source at includes/blocks_widget_create.php shows the parameter flowing to output without a filtering layer, allowing attribute-breaking payloads and inline event handlers.
Attack Vector
Exploitation requires network access to the WordPress admin interface and an authenticated account with Contributor privileges or higher. The attacker submits a crafted className value containing HTML-breaking characters and JavaScript. When any user renders the affected post or page, the browser parses the injected script in the context of the WordPress site origin. This scope-changed behavior enables privilege escalation to administrator accounts if an administrator views the page. See the Wordfence Vulnerability Report for exploitation context and the WordPress Plugin Code Reference for the affected code path.
No verified public code examples are available. Refer to the vendor references for technical details.
Detection Methods for CVE-2025-6255
Indicators of Compromise
- Unexpected <script> tags, inline event handlers, or javascript: URIs stored in WordPress post content or postmeta rows referencing the filter plugin
- Outbound requests from visitor browsers to unfamiliar domains after loading pages that include the plugin's block widget
- New or modified administrator accounts created shortly after Contributor-level users edited filter widget content
- Plugin versions at or below 1.3.7 reported by the WordPress plugin inventory
Detection Strategies
- Audit the wp_posts and wp_postmeta tables for stored HTML tokens containing script fragments in fields tied to the Dynamic AJAX Product Filters plugin
- Monitor WordPress edit_post and save_post actions performed by Contributor-role accounts against pages containing filter blocks
- Deploy content security policy (CSP) reporting to surface script execution originating from unexpected inline sources
Monitoring Recommendations
- Log all changes to plugin settings and block widget configurations, including the account role initiating the change
- Alert on WordPress user role escalations or new administrator account creation events
- Track browser telemetry from authenticated admin sessions for anomalous script activity or redirects
How to Mitigate CVE-2025-6255
Immediate Actions Required
- Update the Dynamic AJAX Product Filters for WooCommerce plugin to a version later than 1.3.7 that includes the fix referenced in WordPress Changeset #3350071
- Review all Contributor, Author, and Editor accounts and remove any that are inactive or unnecessary
- Audit existing posts and pages for injected script content and remove malicious payloads before restoring service
Patch Information
The plugin vendor addressed the vulnerability in a subsequent release; the code change is tracked in WordPress Changeset #3350071. Site administrators should install the patched version through the WordPress plugin manager or WP-CLI. Confirm the installed version reports higher than 1.3.7 after upgrade. Additional developer information is available on the WordPress Plugin Developer Info page.
Workarounds
- Temporarily deactivate the Dynamic AJAX Product Filters for WooCommerce plugin until the patched version is installed
- Restrict Contributor-level and higher accounts to trusted users only, and enforce multi-factor authentication for all editorial roles
- Deploy a web application firewall (WAF) rule to block requests containing script tokens in the className parameter targeted at the plugin's endpoints
- Implement a strict Content Security Policy that disallows inline script execution on pages using the filter block
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
