CVE-2026-75586 Overview
CVE-2026-75586 is a Reflected Cross-Site Scripting (XSS) vulnerability in the Unlimited Elements For Elementor plugin for WordPress. The flaw affects all versions up to and including 2.0.17. Unauthenticated attackers can inject arbitrary JavaScript through the formData[id] parameter processed by a public AJAX handler. Exploitation requires user interaction, typically clicking a crafted link. The vulnerability is tracked under [CWE-79] and has an EPSS probability of 0.215%.
Critical Impact
An unauthenticated attacker can execute arbitrary scripts in a victim's browser session, enabling session theft, credential harvesting, or administrative account takeover when a logged-in administrator is tricked into clicking a malicious link.
Affected Products
- Unlimited Elements For Elementor plugin for WordPress
- All versions up to and including 2.0.17
- WordPress sites exposing the plugin's front-end AJAX endpoint
Discovery Timeline
- 2026-09-05 - CVE-2026-75586 published to NVD
- 2026-09-08 - Last updated in NVD database
Technical Details for CVE-2026-75586
Vulnerability Analysis
The vulnerability exists in the front-end AJAX handler registered on the public wp action. The handler enforces no nonce, capability, or referer check, making it reachable by unauthenticated requests. When the plugin processes form submissions, the attacker-controlled formData[id] value is interpolated verbatim into an exception message. That message is returned to the client without HTML escaping.
The response is served with a text/html content type instead of application/json. The browser then parses the injected markup and executes any embedded scripts. This turns a server-side error path into a reliable reflected XSS sink. The vendor's helper code paths involved are referenced across helper_base.class.php, unitecreator_form.class.php, and unitecreator_filters_process.class.php.
Root Cause
The root cause combines missing request authentication with unsafe output handling. The plugin does not sanitize the formData[id] input, does not escape it before echoing the exception text, and selects the wrong response content type. Any one of these controls — input validation, contextual output escaping, or a strict JSON content type — would have blocked script execution.
Attack Vector
An attacker crafts a URL or HTML form that submits a malicious formData[id] value to the vulnerable AJAX endpoint. When a victim loads the attacker-controlled page or clicks a prepared link, the payload is reflected back and executed in the victim's browser under the origin of the affected WordPress site. If the victim is an authenticated administrator, the attacker can perform privileged actions such as creating users or modifying plugin settings.
No authentication is required, but user interaction is needed. See the Wordfence Vulnerability Report for further technical detail.
Detection Methods for CVE-2026-75586
Indicators of Compromise
- Web server access logs containing admin-ajax.php requests with formData[id] parameters embedding HTML tags such as <script, <img, <svg, or onerror=.
- Referer headers pointing to external domains for requests targeting the plugin's AJAX action.
- Unexpected WordPress administrator account creation or plugin/theme modifications shortly after a suspicious click event.
Detection Strategies
- Inspect HTTP request bodies and query strings for formData[id] values containing URL-encoded angle brackets or JavaScript event handlers.
- Correlate reflected-XSS payloads with subsequent authenticated admin actions from the same client IP or session.
- Deploy a Web Application Firewall (WAF) signature that blocks HTML markup in the formData[id] parameter for the affected AJAX action.
Monitoring Recommendations
- Alert on responses from the plugin AJAX handler that contain text/html content type combined with error keywords and reflected user input.
- Monitor WordPress audit logs for privileged configuration changes following visits to unfamiliar external URLs.
- Track plugin version inventory across all WordPress hosts and flag any installation of Unlimited Elements For Elementor at version 2.0.17 or lower.
How to Mitigate CVE-2026-75586
Immediate Actions Required
- Update the Unlimited Elements For Elementor plugin to a version above 2.0.17 as soon as the vendor publishes a patched release.
- Restrict administrator browsing sessions to trusted content while a fix is pending, and require administrators to log out before visiting untrusted links.
- Enable a WAF rule that inspects and blocks HTML or JavaScript payloads submitted through the plugin's AJAX endpoint.
Patch Information
Review the vendor source references at plugins.trac.wordpress.org and consult the Wordfence Vulnerability Report for the fixed version identifier once released. Apply the update through the WordPress admin plugin manager or via WP-CLI.
Workarounds
- Deactivate the Unlimited Elements For Elementor plugin until a patched release is installed.
- Implement a Content Security Policy (CSP) that disallows inline scripts to reduce the impact of reflected payloads.
- Enforce short session lifetimes and multi-factor authentication for WordPress administrator accounts to limit account takeover risk.
# Configuration example: update the plugin via WP-CLI once a fixed version is released
wp plugin update unlimited-elements-for-elementor
# Or temporarily deactivate the plugin as a workaround
wp plugin deactivate unlimited-elements-for-elementor
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
