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CVE-2026-13756— WP Grid Builder <= 2.3.3 - Authenticated (Subscriber+) Privilege Escalation via 'key' Parameter

Quick assessment

Affected
WP Grid Builder WP Grid Builder
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.

WP Grid Builder plugin for WordPress是WP Grid Builder公司的一款WordPress插件。 WP Grid Builder plugin for WordPress 2.3.3及之前版本存在权限许可和访问控制问题漏洞，该漏洞源于update()处理程序中缺少授权和元键验证，可能导致经过身份验证的攻击者（具有订阅者级别及以上权限）通过使用特制的嵌套数组有效载荷更新自己的wp_capabilities用户元数据，将权限提升至管理员。

CVSS 8.8 · High EPSS 0.44% · P38

Affected Version Matrix 1

VendorProduct Version RangeStatus
WP Grid Builder WP Grid Builder ≤ 2.3.3 affected
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I. Basic Information for CVE-2026-13756

Vulnerability Information
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Vulnerability Title
WP Grid Builder <= 2.3.3 - Authenticated (Subscriber+) Privilege Escalation via 'key' Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
The WP Grid Builder plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 2.3.3. This is due to missing authorization and meta key validation in the `update()` handler for the `/wp-json/wpgb/v2/metadata` REST endpoint. This makes it possible for authenticated attackers, with Subscriber-level access and above, to elevate their privileges to Administrator by updating their own `wp_capabilities` user meta with a crafted nested array payload.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
特权管理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
WP Grid Builder plugin for WordPress 权限许可和访问控制问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WP Grid Builder plugin for WordPress是WP Grid Builder公司的一款WordPress插件。 WP Grid Builder plugin for WordPress 2.3.3及之前版本存在权限许可和访问控制问题漏洞，该漏洞源于update()处理程序中缺少授权和元键验证，可能导致经过身份验证的攻击者（具有订阅者级别及以上权限）通过使用特制的嵌套数组有效载荷更新自己的wp_capabilities用户元数据，将权限提升至管理员。
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
WP Grid Builder WP Grid Builder 0 ~ 2.3.3 -

II. Public POCs for CVE-2026-13756

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III. Intelligence Information for CVE-2026-13756

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Security Blog Posts for CVE-2026-13756 (1)

IV. Related Vulnerabilities

Same weakness: CWE-269