CVE-2026-15662 Overview
CVE-2026-15662 is a Stored Cross-Site Scripting (XSS) vulnerability in the Advanced Woo Labels – Product Labels & Badges for WooCommerce plugin for WordPress. The flaw affects all versions up to and including 2.48 and stems from insufficient input sanitization and output escaping of the bg_color parameter. Authenticated attackers with contributor-level access or higher can inject arbitrary JavaScript that executes in the browser of any user who views an affected page. The weakness is tracked under CWE-79.
Critical Impact
Authenticated contributors can inject persistent JavaScript into WooCommerce label output, enabling session theft, admin account takeover, and redirection of storefront visitors.
Affected Products
- Advanced Woo Labels – Product Labels & Badges for WooCommerce plugin for WordPress
- All plugin versions up to and including 2.48
- WordPress sites running WooCommerce with the vulnerable plugin installed
Discovery Timeline
- 2026-08-01 - CVE-2026-15662 published to NVD
- 2026-08-03 - Last updated in NVD database
Technical Details for CVE-2026-15662
Vulnerability Analysis
The Advanced Woo Labels plugin renders product label styling by consuming user-supplied color values through the bg_color parameter. The plugin fails to sanitize this input on save and does not escape it when producing HTML output. As a result, an attacker can supply a payload containing HTML or JavaScript instead of a valid color value, which is then stored in the database and served to every visitor who loads a page displaying that label.
Because the injection is stored and reflected in styling attributes rendered inline within product pages, the payload persists across sessions. The exploit executes without further attacker interaction whenever a shopper, editor, or administrator opens the affected page. According to the Wordfence Vulnerability Analysis, the vulnerable code paths are located in the plugin's label rendering routines.
Root Cause
The root cause is missing input validation on the bg_color field combined with unescaped output when the label markup is generated. The plugin treats the parameter as trusted data and inserts it directly into HTML context. Relevant code paths include the label view class referenced in the Advanced Woo Labels label view source and the plugin's admin handler at class-awl-admin.php.
Attack Vector
An attacker first obtains contributor-level or higher credentials on the target WordPress site. The attacker then creates or edits a product label and submits a crafted bg_color value containing a script payload, for example breaking out of the style attribute with a quote and appending an event handler. The malicious value is stored, and when any user visits a page that displays the label, the browser executes the injected script in the site's origin. This allows cookie theft, forced actions on behalf of higher-privileged users, and drive-by redirection.
No verified public exploit code is available. See the official plugin changeset for the fix diff.
Detection Methods for CVE-2026-15662
Indicators of Compromise
- Stored label records containing HTML control characters such as <, >, or quote characters within the bg_color field.
- Outbound requests from visitor browsers to attacker-controlled domains sourced from WooCommerce product or shop pages.
- New or modified administrator accounts created shortly after contributor-level users edited product labels.
- Unexpected script tags or inline event handlers appearing in rendered WooCommerce label HTML.
Detection Strategies
- Review the plugin's label configuration tables in the WordPress database for bg_color values that do not match a valid CSS color pattern.
- Inspect web server access logs for POST requests to the WooCommerce admin endpoints that update label styling, correlated with contributor accounts.
- Deploy a web application firewall rule that flags label-update requests containing angle brackets or the string on followed by an event name.
Monitoring Recommendations
- Alert on newly registered or promoted contributor accounts and on unusual editing activity against WooCommerce labels.
- Monitor Content Security Policy violation reports for inline script executions originating from product pages.
- Track WordPress audit logs for changes to Advanced Woo Labels settings and correlate with authentication events.
How to Mitigate CVE-2026-15662
Immediate Actions Required
- Update the Advanced Woo Labels plugin to the version released after 2.48 that includes the fix referenced in the WordPress plugin changeset.
- Audit existing labels and remove any bg_color values that contain non-color characters.
- Review contributor and author accounts and revoke access for any that are unused or unverified.
- Rotate administrator session cookies and force re-authentication after patching.
Patch Information
The vendor addressed the vulnerability in the release that follows plugin version 2.48. The fix adds proper sanitization on save and escaping on output for the bg_color parameter. Site operators should apply the update through the WordPress plugin manager and verify the installed version is greater than 2.48.
Workarounds
- Temporarily deactivate the Advanced Woo Labels plugin until the patched version is installed.
- Restrict contributor and author roles from editing product labels by adjusting WordPress capabilities.
- Implement a strict Content Security Policy that disallows inline scripts and unsafe style attributes on storefront pages.
# Verify installed plugin version and update via WP-CLI
wp plugin get advanced-woo-labels --field=version
wp plugin update advanced-woo-labels
wp plugin list | grep advanced-woo-labels
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
