CVE-2026-59556 Overview
CVE-2026-59556 is an unauthenticated Cross-Site Scripting (XSS) vulnerability affecting the Dynamic Pricing With Discount Rules for WooCommerce WordPress plugin in versions 4.5.11 and earlier. The flaw is classified under [CWE-79], improper neutralization of input during web page generation. An unauthenticated attacker can inject malicious script content that executes in a victim's browser when the victim interacts with a crafted link or page. Because the scope is changed, injected script can affect resources beyond the vulnerable component, including administrative sessions.
Critical Impact
Successful exploitation allows attackers to run arbitrary JavaScript in the context of site visitors or administrators, enabling session theft, WooCommerce store manipulation, and further compromise of the WordPress instance.
Affected Products
- Dynamic Pricing With Discount Rules for WooCommerce plugin (aco-woo-dynamic-pricing) versions <= 4.5.11
- WordPress sites running WooCommerce with the affected plugin installed
- E-commerce deployments exposing the plugin's endpoints to unauthenticated visitors
Discovery Timeline
- 2026-07-27 - CVE-2026-59556 published to NVD
- 2026-07-27 - Last updated in NVD database
Technical Details for CVE-2026-59556
Vulnerability Analysis
The plugin fails to properly neutralize user-controllable input before rendering it in HTML responses. An unauthenticated attacker crafts a request or URL containing JavaScript payloads, then delivers it to a target user through phishing, forum posts, or malicious referrers. When the victim loads the resulting page, the injected script executes in the browser under the origin of the vulnerable WordPress site.
Because exploitation requires user interaction and the attack scope is changed, the payload can pivot from the plugin context to other site resources. Typical outcomes include stealing authentication cookies, forging administrative actions in WooCommerce, injecting rogue payment redirects, and delivering additional client-side malware to shoppers.
Root Cause
The root cause is missing or incomplete output encoding on request parameters reflected into HTML by the plugin. Input sanitization routines such as sanitize_text_field() and context-aware escaping functions like esc_html(), esc_attr(), or wp_kses() are not consistently applied to attacker-controlled values before they are echoed into the response.
Attack Vector
The vulnerability is exploitable over the network without authentication and requires the victim to click a crafted link or visit an attacker-influenced page. See the Patchstack Vulnerability Advisory for technical details on the affected parameters and payload delivery.
No public exploit code has been published, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.
Detection Methods for CVE-2026-59556
Indicators of Compromise
- Web server access logs containing requests with <script>, onerror=, onload=, or URL-encoded JavaScript payloads targeting plugin endpoints under /wp-content/plugins/aco-woo-dynamic-pricing/
- Unexpected outbound requests from administrator browsers to attacker-controlled domains shortly after loading WooCommerce pages
- New or modified WordPress administrator accounts, plugin installations, or wp_options changes without a corresponding admin action
Detection Strategies
- Deploy a web application firewall (WAF) rule set that flags reflected script patterns in query parameters and POST bodies directed at the plugin
- Correlate WordPress audit logs with front-end web logs to detect privileged actions that follow suspicious client-side requests
- Scan installed plugin versions across the estate to identify hosts still running aco-woo-dynamic-pricing version 4.5.11 or earlier
Monitoring Recommendations
- Monitor for anomalous session activity such as administrator sessions originating from new IP addresses or geographies
- Alert on modifications to WooCommerce checkout, payment gateway, or theme files following visits to plugin URLs
- Track Content Security Policy (CSP) violation reports for inline script execution on WooCommerce store pages
How to Mitigate CVE-2026-59556
Immediate Actions Required
- Update the Dynamic Pricing With Discount Rules for WooCommerce plugin to a version above 4.5.11 as soon as a fixed release is available from the vendor
- If no patched version is available, deactivate and remove the plugin from all WordPress installations
- Force logout of all active WordPress sessions and rotate administrator passwords and application passwords
Patch Information
Refer to the Patchstack Vulnerability Advisory for the latest fixed version and vendor guidance. Apply the update through the WordPress plugin manager or by replacing the plugin directory with the patched release.
Workarounds
- Enforce a strict Content Security Policy that disallows inline scripts and restricts script sources to trusted origins
- Deploy WAF signatures that block reflected XSS payloads targeting aco-woo-dynamic-pricing request parameters
- Restrict administrative access to WordPress with network-level controls and multi-factor authentication to reduce impact of stolen sessions
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
