CVE-2025-28889 Overview
CVE-2025-28889 is a reflected cross-site scripting (XSS) vulnerability in the Custom Product Stickers for Woocommerce WordPress plugin developed by starblank. The flaw exists in all plugin versions up to and including 1.9.0. The plugin fails to properly neutralize user-controllable input before reflecting it into generated web pages, enabling attackers to inject and execute arbitrary JavaScript in a victim's browser session. The issue is tracked under CWE-79 and affects WordPress sites running WooCommerce with this plugin enabled.
Critical Impact
Successful exploitation lets unauthenticated attackers execute arbitrary JavaScript in the context of a victim's session, enabling cookie theft, session hijacking, defacement, and redirection to attacker-controlled infrastructure.
Affected Products
- Custom Product Stickers for WooCommerce plugin versions up to and including 1.9.0
- WordPress sites running the vulnerable plugin alongside WooCommerce
- Any administrator or customer account interacting with crafted plugin URLs
Discovery Timeline
- 2025-03-26 - CVE-2025-28889 published to NVD
- 2026-04-23 - Last updated in NVD database
Technical Details for CVE-2025-28889
Vulnerability Analysis
The vulnerability stems from improper neutralization of input during web page generation, classified as [CWE-79]. The Custom Product Stickers for Woocommerce plugin accepts user-supplied parameters and reflects them into HTML responses without sufficient encoding or sanitization. An attacker crafts a malicious URL containing JavaScript payloads in vulnerable parameters and tricks a victim into clicking it. The browser then executes the injected script under the origin of the target WordPress site.
Because the issue requires user interaction and operates across a security scope change, injected scripts can act on behalf of authenticated users, including site administrators. Attackers can use this primitive to exfiltrate session cookies, perform actions through the WordPress REST API, or pivot to plugin and theme management endpoints. Refer to the Patchstack XSS Vulnerability Report for technical details.
Root Cause
The root cause is missing output encoding on request parameters that are echoed back into HTML responses. The plugin does not apply WordPress sanitization functions such as esc_html(), esc_attr(), or wp_kses() to user-controlled data before rendering it inside page markup.
Attack Vector
Exploitation occurs over the network with no authentication required. The attacker constructs a URL containing a JavaScript payload in a vulnerable query parameter and delivers it through phishing, malvertising, or third-party site embeds. When a logged-in WordPress user visits the link, the payload executes within the trusted origin.
No verified public proof-of-concept code is available for this CVE. The vulnerability mechanism follows the standard reflected XSS pattern where unsanitized request parameters are written directly into the HTTP response body.
Detection Methods for CVE-2025-28889
Indicators of Compromise
- Inbound HTTP requests to WooCommerce or plugin endpoints containing URL-encoded <script>, javascript:, onerror=, or onload= substrings in query parameters
- Web server access logs showing reflected parameter values with HTML or JavaScript syntax originating from external referrers
- Unexpected administrative actions performed shortly after an admin clicks an external link, such as new user creation or plugin installation
Detection Strategies
- Inspect web application firewall (WAF) telemetry for reflected XSS signatures targeting plugin parameters
- Correlate WordPress audit logs with web access logs to identify admin sessions interacting with malicious referrers
- Enumerate installed WordPress plugins and flag any installation of custom-product-stickers-for-woocommerce at version 1.9.0 or earlier
Monitoring Recommendations
- Enable Content Security Policy (CSP) reporting to capture script execution from unexpected sources
- Monitor outbound DNS and HTTP traffic from administrator browsers for connections to unknown domains after WordPress logins
- Alert on creation of new administrator accounts, REST API token issuance, or modifications to wp_options outside of approved change windows
How to Mitigate CVE-2025-28889
Immediate Actions Required
- Identify all WordPress sites running Custom Product Stickers for Woocommerce version 1.9.0 or earlier and prioritize them for remediation
- Disable or deactivate the plugin until a patched release is confirmed available from the vendor
- Force a session refresh and password rotation for administrator accounts that may have clicked untrusted links
Patch Information
No fixed version is listed in the available CVE record at time of publication. Affected sites should consult the Patchstack advisory and the plugin page on WordPress.org for the latest patched release. Apply the vendor-supplied update once published.
Workarounds
- Deploy a WAF rule that blocks requests containing HTML and JavaScript metacharacters in parameters bound for the plugin's endpoints
- Implement a strict Content Security Policy that disallows inline scripts and restricts script sources to trusted origins
- Restrict administrator access to the WordPress dashboard using IP allowlists or VPN-only access while the plugin remains unpatched
# Configuration example: temporarily deactivate the vulnerable plugin via WP-CLI
wp plugin deactivate custom-product-stickers-for-woocommerce
wp plugin list --status=active --format=table
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
