CVE-2026-8865

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.

• CWE-79

• https://plugins.trac.wordpress.org/browser/avalon23-products-filter-for-woocommerce/trunk/classes/helper.php#L17
• https://plugins.trac.wordpress.org/browser/avalon23-products-filter-for-woocommerce/trunk/ext/qr_generator/index.php#L113
• https://plugins.trac.wordpress.org/browser/avalon23-products-filter-for-woocommerce/trunk/ext/qr_generator/index.php#L96
• https://www.wordfence.com/threat-intel/vulnerabilities/id/da9089a2-420f-4744-96d1-46c050a95328?source=cve

Published

Jun 24, 2026

Last Modified

Jun 25, 2026

Status

Deferred

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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