themegrill Zakra Plugin up to 4.2.0 on WordPress REST API register_post_meta cross site scripting

Summaryinfo

A vulnerability was found in themegrill Zakra Plugin up to 4.2.0 on WordPress. It has been declared as problematic. This impacts the function register_post_meta of the component REST API. Such manipulation leads to cross site scripting. This vulnerability is listed as CVE-2026-4804. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in themegrill Zakra Plugin up to 4.2.0 on WordPress and classified as problematic. Affected by this issue is the function register_post_meta of the component REST API. The manipulation with an unknown input leads to a cross site scripting 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 Zakra theme for WordPress is vulnerable to Stored Cross-Site Scripting via post meta values in all versions up to, and including, 4.2.0. This is due to the theme registering three post meta fields (zakra_menu_item_color, zakra_menu_item_hover_color, and zakra_menu_item_active_color) with 'show_in_rest' => true and 'auth_callback' => '__return_true', but without any sanitize_callback parameter in the register_post_meta() calls. While the classic editor save path applies sanitize_hex_color() sanitization, the REST API path completely bypasses this protection. The unsanitized meta values are then retrieved via get_post_meta() and concatenated directly into CSS strings that are output through wp_add_inline_style() without any escaping. 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 the injected page.

The weakness was presented by Osvaldo Noe Gonzalez Del Rio. The advisory is shared for download at wordfence.com. This vulnerability is handled as CVE-2026-4804 since 03/25/2026. The exploitation is known to be easy. The attack may be launched remotely. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.007.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• WordPress Plugin

Vendor

• themegrill

Name

• Zakra Plugin

Version

• 4.0
• 4.1
• 4.2.0

CPE 2.3info

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CPE 2.2info

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