CVE-2026-8865

Deferred Deferred - Pending Action

Stored XSS in Avalon23 Products Filter for WooCommerce Plugin

Publication date: 2026-06-24

Last updated on: 2026-06-25

Assigner: Wordfence

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.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-06-24

Last Modified

2026-06-25

Generated

2026-07-14

AI Q&A

2026-06-24

EPSS Evaluated

2026-07-13

NVD

CVE-2026-8865

EUVD

EUVD-2026-38683

Affected Vendors & Products

Vendor	Product	Version / Range
avalon23	products_filter	to 1.1.6 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-79	The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

Executive Summary

The Avalon23 Products Filter for WooCommerce plugin for WordPress has a Stored Cross-Site Scripting (XSS) vulnerability in all versions up to and including 1.1.6. This vulnerability arises because user-supplied shortcode attributes, specifically 'title' and 'fixed_link', are not properly sanitized or escaped before being inserted into HTML attributes. An attacker with Contributor-level access or higher can inject malicious scripts that will execute whenever a user views the affected page.

Impact Analysis

This vulnerability allows an authenticated attacker with Contributor-level access or above to inject arbitrary web scripts into pages. These scripts execute in the context of users who visit the injected pages, potentially leading to theft of sensitive information, session hijacking, or other malicious actions. The CVSS score indicates a moderate severity with impacts on confidentiality and integrity but no impact on availability.

Mitigation Strategies

To mitigate this vulnerability, you should update the Avalon23 Products Filter for WooCommerce plugin to a version later than 1.1.6 where the issue is fixed.

Additionally, restrict Contributor-level and higher user access until the update is applied, as the vulnerability requires authenticated users with at least Contributor privileges to exploit.

Implement input sanitization and output escaping for shortcode attributes, especially 'title' and 'fixed_link', to prevent injection of arbitrary scripts.

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