CVE-2026-4077 Overview
The Ecover Builder For Dummies plugin for WordPress contains a Stored Cross-Site Scripting (XSS) vulnerability in the ecover shortcode. The flaw affects all versions up to and including 1.0. The plugin fails to properly sanitize and escape the user-supplied id shortcode attribute before rendering it in page output. Authenticated users with Contributor-level access or higher can inject arbitrary JavaScript into pages. The injected scripts execute in the browser of any visitor who views the affected page. The vulnerability is tracked under [CWE-79] and was disclosed in the Wordfence Vulnerability Report.
Critical Impact
Authenticated contributors can inject persistent JavaScript that executes against site visitors and administrators, enabling session hijacking, account takeover, and content defacement.
Affected Products
- Ecover Builder For Dummies plugin for WordPress — all versions through 1.0
- WordPress sites permitting Contributor-level or higher registration
- Any WordPress installation using the ecover shortcode
Discovery Timeline
- 2026-03-21 - CVE-2026-4077 published to NVD
- 2026-04-24 - Last updated in NVD database
Technical Details for CVE-2026-4077
Vulnerability Analysis
The vulnerability resides in the plugin's shortcode handler defined in plugin_builder.php. When the ecover shortcode is rendered, the plugin reads the id attribute from user input and embeds it directly into the HTML response. The handler does not apply WordPress sanitization helpers such as sanitize_text_field() or output-escaping functions such as esc_attr() or esc_html().
Because the malicious payload is stored within post content, the script persists across page loads. Every visitor who renders the affected page triggers execution in their browser session. The scope change reflects that script execution occurs in the context of the WordPress site rather than the attacker-controlled component.
Root Cause
The root cause is insufficient input validation and missing output encoding on the id shortcode attribute. The plugin trusts the contributor-supplied value and writes it into the rendered DOM without filtering. Lines 39, 44, and 58 of plugin_builder.php handle the unsafe attribute concatenation.
Attack Vector
An authenticated attacker with at least Contributor privileges creates or edits a post containing the ecover shortcode. The attacker supplies a crafted id value containing HTML or JavaScript breakout characters. When the post is previewed, submitted for review, or published, the stored payload executes against any user who loads the page — including administrators reviewing pending submissions. Successful exploitation enables cookie theft, forced administrative actions via CSRF, and redirection to attacker-controlled infrastructure.
The vulnerability cannot be exploited code-free here because no verified proof-of-concept has been published. See the Wordfence advisory for additional technical context.
Detection Methods for CVE-2026-4077
Indicators of Compromise
- Post or page content containing the [ecover] shortcode with id attribute values that include <script>, onerror=, onload=, or javascript: tokens
- Unexpected outbound requests from visitor browsers to unfamiliar domains after viewing pages with the ecover shortcode
- New or modified posts authored by Contributor accounts shortly before administrator session anomalies
- Browser console errors or unexpected DOM nodes injected into pages rendered by the affected plugin
Detection Strategies
- Audit the wp_posts table for shortcode invocations using SELECT ID, post_title FROM wp_posts WHERE post_content LIKE '%[ecover%'; and inspect attribute values
- Deploy a Web Application Firewall (WAF) rule that flags shortcode attributes containing HTML tags or JavaScript event handlers
- Monitor WordPress audit logs for post creation and edit events by low-privilege roles, correlating against shortcode usage
Monitoring Recommendations
- Forward WordPress access and PHP error logs to a centralized SIEM for query against XSS signatures
- Track changes to user role assignments and pending review queues to identify suspicious contributor activity
- Enable Content Security Policy (CSP) reporting endpoints to capture blocked script executions originating from injected payloads
How to Mitigate CVE-2026-4077
Immediate Actions Required
- Deactivate and remove the Ecover Builder For Dummies plugin from all WordPress installations until a patched version is released
- Audit existing posts and pages for malicious ecover shortcode usage and remove suspect content
- Review Contributor-level and higher accounts for unfamiliar or recently created users and revoke unnecessary access
- Force password resets for administrative accounts that may have viewed compromised pages
Patch Information
No patched version has been published as of the last NVD update on 2026-04-24. All versions up to and including 1.0 remain vulnerable. Site operators should monitor the WordPress plugin repository and the Wordfence advisory for fix availability.
Workarounds
- Restrict Contributor and Author registration on public WordPress sites until the plugin is patched
- Deploy a WAF rule blocking shortcode attribute values containing <, >, or JavaScript event handler patterns
- Enforce a strict Content Security Policy that prohibits inline scripts and limits script sources to trusted domains
- Require editorial review of all Contributor submissions in a sandboxed browser session before publishing
# Configuration example: disable the plugin via WP-CLI
wp plugin deactivate ecover-builder-for-dummies
wp plugin delete ecover-builder-for-dummies
# Audit posts for suspicious shortcode usage
wp db query "SELECT ID, post_title, post_author FROM wp_posts WHERE post_content LIKE '%[ecover%';"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
