CVE-2025-27347: WooCommerce Direct Checkout XSS Vulnerability

CVE-2025-27347 Overview

CVE-2025-27347 is a stored Cross-Site Scripting (XSS) vulnerability in the techmix Direct Checkout Button for WooCommerce WordPress plugin. The flaw affects all versions up to and including 1.0 of the woo-direct-checkout-button plugin. It stems from improper neutralization of input during web page generation, classified under [CWE-79]. Authenticated attackers with low privileges can inject malicious JavaScript that persists in the application and executes in the browsers of other users, including administrators.

Critical Impact

Successful exploitation enables attackers to run arbitrary script in victim browsers, hijack sessions, and pivot to administrative actions within WordPress sites running vulnerable versions of the plugin.

Affected Products

• Direct Checkout Button for WooCommerce (woo-direct-checkout-button) versions n/a through 1.0
• WordPress sites with the techmix plugin installed and active
• WooCommerce storefronts relying on the affected checkout button component

Discovery Timeline

• 2025-02-24 - CVE-2025-27347 published to the National Vulnerability Database (NVD)
• 2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-27347

Vulnerability Analysis

The vulnerability is a stored XSS issue in the Direct Checkout Button for WooCommerce plugin. Attacker-supplied input is written to persistent storage and later rendered without proper output encoding. Because the payload persists in the database, every visitor loading the affected page executes the injected script.

The scope is changed per the CVSS vector, meaning the vulnerable component can affect resources beyond its security authority. In practice, an attacker with contributor-level access can compromise an authenticated administrator viewing the affected content. Exploitation requires user interaction, typically loading a page that renders the malicious payload.

Root Cause

The plugin fails to sanitize input on write and does not escape output on render. Plugin code paths that emit configuration or content values into HTML omit calls to WordPress escaping helpers such as esc_html(), esc_attr(), or wp_kses_post(). This missing neutralization allows raw <script> tags or event-handler attributes to reach the DOM of visitors.

Attack Vector

An authenticated attacker submits a payload through a plugin field that accepts checkout button configuration. The payload persists in the WordPress database. When a legitimate user, including an administrator, loads a page rendering the stored value, the browser executes the attacker script within the site origin. Refer to the Patchstack WooCommerce XSS Vulnerability advisory for advisory-level detail.

// No verified proof-of-concept is publicly available.
// See the Patchstack advisory for vendor-provided technical details.

Detection Methods for CVE-2025-27347

Indicators of Compromise

• Unexpected <script> tags or on*= event handlers in WooCommerce checkout button configuration fields stored in wp_options or plugin-specific tables
• Outbound requests from administrator sessions to attacker-controlled domains shortly after loading pages rendered by the plugin
• New or modified WordPress administrator accounts created without a corresponding audit log entry

Detection Strategies

• Review the plugin's stored settings for HTML or JavaScript content that should be plain text or a URL
• Inspect web server access logs for POST requests to plugin admin endpoints from low-privilege user sessions
• Correlate WordPress user activity with browser-generated requests to identify script execution patterns consistent with stored XSS

Monitoring Recommendations

• Enable WordPress audit logging to capture plugin option changes and administrator actions
• Deploy a Web Application Firewall (WAF) with rules to flag script tags and JavaScript event handlers submitted through plugin forms
• Alert on Content Security Policy (CSP) violation reports referencing checkout pages

How to Mitigate CVE-2025-27347

Immediate Actions Required

• Deactivate and remove the Direct Checkout Button for WooCommerce plugin until a patched version above 1.0 is released
• Audit all stored plugin settings and remove any HTML or JavaScript payloads
• Rotate WordPress administrator passwords and invalidate active sessions if evidence of exploitation exists

Patch Information

At the time of NVD publication, no fixed version above 1.0 is documented in the advisory. Monitor the Patchstack advisory and the WordPress plugin repository for vendor updates.

Workarounds

• Restrict plugin configuration access to trusted administrator accounts only
• Enforce a strict Content Security Policy that disallows inline scripts on WooCommerce pages
• Replace the vulnerable plugin with an actively maintained alternative that provides equivalent checkout button functionality

# Example: enforce a restrictive CSP header via Apache
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'"