Elementor Website Builder Plugin up to 4.0.4 on WordPress HTML Widget json_decode _elementor_data HTML injection

Summaryinfo

A vulnerability was found in Elementor Website Builder Plugin up to 4.0.4 on WordPress. It has been declared as problematic. The impacted element is the function json_decode of the component HTML Widget. Such manipulation of the argument _elementor_data leads to HTML injection. This vulnerability is uniquely identified as CVE-2026-6127. The attack can be launched remotely. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Elementor Website Builder Plugin up to 4.0.4 on WordPress. It has been rated as problematic. Affected by this issue is the function json_decode of the component HTML Widget. The manipulation of the argument _elementor_data with an unknown input leads to a html injection vulnerability. Using CWE to declare the problem leads to 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. Impacted is integrity. CVE summarizes:

The Elementor Website Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the _elementor_data meta field in versions up to, and including, 4.0.4. This is due to insufficient input sanitization when processing form-encoded REST API requests. The plugin registers the _elementor_data meta field with show_in_rest but omits a sanitize_callback, relying instead on a rest_pre_insert_post filter (sanitize_post_data function) that only sanitizes JSON-encoded request bodies. When a contributor sends a form-encoded PATCH request to the WordPress REST API, the json_decode() call on the raw body returns null, causing all sanitization to be skipped. The unsanitized data is then stored via update_post_meta() and later output without escaping through multiple widget sinks including the HTML widget's print_unescaped_setting() function. 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.

The weakness was disclosed by Jonah Burgess. The advisory is available at wordfence.com. This vulnerability is handled as CVE-2026-6127 since 04/12/2026. The exploitation is known to be easy. The attack may be launched remotely. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

Upgrading to version 4.0.1 eliminates this vulnerability.

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Productinfo

Type

• WordPress Plugin

Name

• Elementor Website Builder Plugin

Version

• 4.0.0
• 4.0.1
• 4.0.2
• 4.0.3
• 4.0.4

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