EUVD-2026-38683
GHSA-hxr4-2fcj-gcw3
Severity by source
AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
PR:L confirmed by Contributor-level requirement; S:C reflects browser-context execution; UI:N because stored XSS triggers on passive page load without victim action.
Primary rating from Vendor (Wordfence).
CVSS VectorVendor: Wordfence
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
Stored Cross-Site Scripting in Avalon23 Products Filter for WooCommerce (≤1.1.6) allows authenticated Contributors to inject persistent JavaScript via the avalon23_qr shortcode's title and fixed_link attributes, which are concatenated unsanitized into single-quoted HTML attributes by AVALON23_HELPER::draw_html_item(). The payload is stored in the WordPress database and executes in the browser of any user who subsequently visits an injected page, enabling session hijacking, credential theft, or unauthorized administrative actions. No public exploit has been identified at time of analysis and the vulnerability is not listed in CISA KEV.
Technical ContextAI
This is a CWE-79 (Improper Neutralization of Input During Web Page Generation) Stored XSS flaw in a WordPress plugin that extends WooCommerce with product filtering and QR code generation capabilities. The root cause is the AVALON23_HELPER::draw_html_item() helper (classes/helper.php:L17) directly concatenating shortcode attribute values - specifically title and fixed_link from the [avalon23_qr] shortcode - into single-quoted HTML attribute contexts without invoking WordPress's esc_attr() function or any equivalent encoding. The QR generator component at ext/qr_generator/index.php (lines 96 and 113) participates in this unsafe rendering pipeline. Because single-quote characters can break out of the attribute context without esc_attr(), an attacker-controlled value can introduce event handlers or script URLs. Shortcode attributes in WordPress are user-supplied at post authoring time, making this a persistent (stored) variant of XSS: the payload survives in the post database record and is rendered to every subsequent page visitor. Affected CPE: cpe:2.3:a:paradigmatools:avalon23_products_filter_for_woocommerce:*:*:*:*:*:*:*:*.
RemediationAI
No vendor-released patch has been identified at time of analysis for versions up to and including 1.1.6. Site administrators should consult the Wordfence advisory at https://www.wordfence.com/threat-intel/vulnerabilities/id/da9089a2-420f-4744-96d1-46c050a95328 and monitor the WordPress plugin repository for a patched release. As an immediate compensating control, deactivating or removing the Avalon23 Products Filter for WooCommerce plugin eliminates the attack surface entirely with no impact to core WordPress or WooCommerce functionality. If the plugin cannot be deactivated, restrict the WordPress Contributor role to fully trusted users only, since exploitation requires at minimum Contributor-level authentication - this removes the untrusted-user attack path without affecting site layout. Deploying a WAF rule to detect and block shortcode injection patterns in the avalon23_qr shortcode attribute fields (particularly title and fixed_link containing script or event handler payloads) provides an additional detection and blocking layer, though WAF rules for stored XSS carry a risk of false positives on legitimate rich-text content. Applying a Content Security Policy header that restricts inline script execution limits the impact of any injected payload even if delivery succeeds.
More in Wordpress Plugin
View allThe Backup Migration plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 1
The Hash Form - Drag & Drop Form Builder plugin for WordPress is vulnerable to arbitrary file uploads due to missing fil
Authentication bypass in the LiteSpeed Cache WordPress plugin (versions prior to 6.5.0.1) allows unauthenticated remote
The Simple File List plugin for WordPress through version 4.2.2 contains an unauthenticated remote code execution vulner
The SureTriggers WordPress plugin through version 1.0.82 contains a privilege escalation vulnerability that allows unaut
The Ninja Forms plugin before 2.9.42.1 for WordPress allows remote attackers to conduct PHP object injection attacks via
The Business Directory Plugin - Easy Listing Directories for WordPress plugin for WordPress is vulnerable to time-based
SQL injection in the NotificationX WordPress plugin (versions up to and including 2.8.2) allows unauthenticated remote a
The POST SMTP Mailer - Email log, Delivery Failure Notifications and Best Mail SMTP for WordPress plugin for WordPress i
The MasterStudy LMS WordPress Plugin - for Online Courses and Education plugin for WordPress is vulnerable to union base
The Email Subscribers by Icegram Express plugin for WordPress is vulnerable to SQL Injection via the ‘hash’ parameter in
Remote code execution in the WP Query Console WordPress plugin (versions up to and including 1.0) by Ajit Bohra allows u
Same weakness CWE-79 – Cross-site Scripting (XSS)
View allShare
External POC / Exploit Code
Leaving vuln.today