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CVE-2026-4804— Zakra <= 4.2.0 - Authenticated (Contributor+) Stored Cross-Site Scripting via Post Meta REST API

Quick assessment

Affected
themegrill Zakra
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ThemeGrill Zakra是ThemeGrill公司的一款WordPress主题开发框架。 ThemeGrill Zakra 4.2.0及之前版本存在跨站脚本漏洞，该漏洞源于主题注册的三个post meta字段（zakra_menu_item_color、zakra_menu_item_hover_color和zakra_menu_item_active_color）在register_post_meta()调用中未设置sanitize_callback参数，导致REST API路径绕过saniti

CVSS 6.4 · Medium EPSS 0.28% · P19

Affected Version Matrix 1

VendorProduct Version RangeStatus
themegrill Zakra ≤ 4.2.0 affected
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I. Basic Information for CVE-2026-4804

Vulnerability Information
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Vulnerability Title
Zakra <= 4.2.0 - Authenticated (Contributor+) Stored Cross-Site Scripting via Post Meta REST API
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
ThemeGrill Zakra 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ThemeGrill Zakra是ThemeGrill公司的一款WordPress主题开发框架。 ThemeGrill Zakra 4.2.0及之前版本存在跨站脚本漏洞，该漏洞源于主题注册的三个post meta字段（zakra_menu_item_color、zakra_menu_item_hover_color和zakra_menu_item_active_color）在register_post_meta()调用中未设置sanitize_callback参数，导致REST API路径绕过saniti
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
themegrill Zakra 0 ~ 4.2.0 -

II. Public POCs for CVE-2026-4804

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III. Intelligence Information for CVE-2026-4804

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Vendor Advisories for CVE-2026-4804 (1)

IV. Related Vulnerabilities

Same product: Zakra
Same vendor: themegrill
Same weakness: CWE-79

V. Comments for CVE-2026-4804

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