CVE-2026-13756
HighCVSS 8.8Exploitation Probability (EPSS)
Low risk23th percentile - higher than 23% of all known CVEs
Summary
The WP Grid Builder plugin for WordPress up to version 2.3.3 contains a privilege escalation vulnerability. Missing authorization and meta key validation in the `/wp-json/wpgb/v2/metadata` REST endpoint allow authenticated users with Subscriber-level access or higher to escalate their privileges to Administrator by updating their own `wp_capabilities` user meta with a crafted nested array payload.
Risk Assessment
The organization is at risk of unauthorized full control over the WordPress installation by low-privileged users, potentially leading to data theft, website defacement, or further compromise of the infrastructure.
Recommendation
Immediately update the WP Grid Builder plugin to the latest available version that fixes this vulnerability. If an update is not possible, temporarily disable the plugin or block access to the `/wp-json/wpgb/v2/metadata` REST endpoint for unauthorized users.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS