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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://docs.wpgridbuilder.com/changelog/
- https://www.wordfence.com/threat-intel/vulnerabilities/id/6a42e0e8-a8c7-4bc5-80c
FAQ
What is CVE-2026-13756?
CVE-2026-13756 is a vulnerability with a CVSS score of 8.8 (HIGH). 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(...
How severe is CVE-2026-13756?
CVE-2026-13756 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-13756?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.