CVE-2026-13756 WP Grid Builder <= 2.3.3 - Authenticated (Subscriber+) Privilege Escalation via 'key' Parameter
Authenticated subscribers can escalate privileges to Administrator by exploiting missing authorization in the WP Grid Builder plugin's metadata REST endpoint.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-13756?
CVE-2026-13756 is a high-severity vulnerability in WP Grid Builder, published on 11 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-269
Which versions are affected by CVE-2026-13756?
How do I fix CVE-2026-13756?
No fix has been published for CVE-2026-13756 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-13756 being exploited?
There is no known exploitation of CVE-2026-13756 in the wild and no public exploit code.
Sources
Also known as GHSA-9qvw-92r9-h632.