CVE-2026-8865
MediumCVSS 6.4Exploitation Probability (EPSS)
Low risk9th percentile - higher than 9% of all known CVEs
Summary
The Avalon23 Products Filter for WooCommerce plugin for WordPress is vulnerable to Stored Cross-Site Scripting (XSS) via the 'avalon23_qr' shortcode in versions up to 1.1.6. This is due to insufficient input sanitization and output escaping on user-supplied shortcode attributes.
Risk Assessment
Authenticated attackers with Contributor-level access and above can inject arbitrary web scripts that will execute whenever a user accesses the injected page. This poses a serious threat to user data security and site integrity.
Recommendation
It is recommended to update the plugin to the latest version to mitigate this vulnerability. Additionally, conducting a security audit to identify and eliminate potential XSS threats is advisable.
Original NVD description (English source)
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.