CVE-2026-15284

King Addons for Elementor <= 51.1.62 - Authenticated (Subscriber+) Stored Cross-Site Scripting via 'form_page_id' Parameter

2026-06-15 17:09
Naoya Takahashi (nakko)

Strategic Overview

Status
Patched in 51.1.63
Affected Plugin
King Addons for Elementor – 80+ Elementor Widgets, 4 000+ Elementor Templates, WooCommerce, Mega Menu, Popup Builder
Affected Version
<= 51.1.62
CVSS
6.4Medium
Weakness type
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE
CVE-2026-15284
View all King Addons for Elementor – 80+ Elementor Widgets, 4 000+ Elementor Templates, WooCommerce, Mega Menu, Popup Builder vulnerabilities

At a glance

CVE-2026-15284 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the King Addons for Elementor WordPress plugin, affecting versions <= 51.1.62. It carries a CVSS score of 6.4 (reachable over the network; low attack complexity). Exploitation requires an authenticated account at Subscriber level or above. The issue is fixed in version 51.1.63; sites on affected versions should update now. Disclosed June 2026, reported by Naoya Takahashi (nakko).

Vulnerability Overview

The King Addons for Elementor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'form_page_id' parameter in versions up to, and including, 51.1.62 This is due to insufficient input sanitization in the add_to_submissions() function, which applies sanitize_text_field() (which preserves double-quote characters) before storing the value in post meta, combined with missing output escaping in the king_addons_submissions_custom_column_content() function, which concatenates the stored value into an HTML href attribute via admin_url() without wrapping the result in esc_url(). This makes it possible for authenticated attackers, with subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no interaction from a victim user.

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

King Addons for Elementor <= 51.1.62 carries this weakness at form_page_id, and reaching it takes an account at Subscriber level or above. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.

Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. For King Addons for Elementor the fix is 51.1.63: builds <= 51.1.62 are affected, anything from 51.1.63 onward is not.

Remediation

Update to version 51.1.63, or a newer patched version

How does WordSec protect against this?

An attacker needs Subscriber access first, so the firewall sees the attempt as traffic from a logged-in account: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: King Addons for Elementor 51.1.63 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-15284https://www.wordfence.com/threat-intel/vulnerabilities/id/349ba9de-69b3-42fb-aeba-c3a24280547fhttps://nvd.nist.gov/vuln/detail/CVE-2026-15284

Related records

Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C