CVE-2026-8865
Description
The Avalon23 Products Filter for WooCommerce plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'avalon23_qr' shortcode in all versions up to, and including, 1.1.6. This is due to insufficient input sanitization and output escaping on user-supplied shortcode attributes (notably 'title' and 'fixed_link') which are concatenated directly into single-quoted HTML attributes by the AVALON23_HELPER::draw_html_item() helper without esc_attr() or any other encoding. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Summary dbcve.org
The Avalon23 Products Filter for WooCommerce plugin has a stored XSS vulnerability in versions up to 1.1.6. The 'avalon23_qr' shortcode handler directly concatenates user-supplied 'title' and 'fixed_link' attributes into single-quoted HTML attributes without esc_attr() or any output escaping, allowing authenticated Contributors+ to inject malicious JavaScript that executes when users view affected pages.
Mitigation
Update the plugin to version 1.1.7 or later which applies proper escaping via esc_attr(); alternatively, disable the vulnerable shortcode until patched.