EUVD-2026-43118
GHSA-9qvw-92r9-h632
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Network-reachable REST endpoint with no user interaction and low complexity, but requires an existing Subscriber account (PR:L); admin takeover yields full C/I/A impact.
Primary rating from Vendor (wordfence).
CVSS VectorVendor: wordfence
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
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.
Articles & Coverage 1
AnalysisAI
Privilege escalation in the WP Grid Builder WordPress plugin (versions ≤ 2.3.3) lets an authenticated Subscriber-or-above user promote their own account to Administrator by sending a crafted nested-array payload to the /wp-json/wpgb/v2/metadata REST endpoint. The endpoint's update() handler lacks both an authorization check and meta-key validation, so an attacker can overwrite their own wp_capabilities user meta. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires a valid authenticated account at Subscriber level or above (PR:L) - the primary limiting factor, so sites without open/self-service user registration are substantially harder to exploit. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Signals are largely consistent toward a genuine high priority. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker registers (or acquires) a Subscriber account on a WordPress site running WP Grid Builder ≤ 2.3.3, then sends an authenticated POST to `/wp-json/wpgb/v2/metadata` with a crafted nested-array payload that writes `administrator => 1` into their own `wp_capabilities` user meta. Because the `update()` handler skips authorization and meta-key validation, the account is instantly elevated to Administrator, granting full site control including plugin/theme editing and PHP code execution. … |
| Remediation | Update WP Grid Builder to the first release above 2.3.3 as published on the vendor changelog (https://docs.wpgridbuilder.com/changelog/); the input data does not name an exact patched version, so no vendor-released patch version is independently confirmed here - verify the fixed build against the changelog before deploying. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all WordPress installations with WP Grid Builder ≤2.3.3; disable the plugin immediately or restrict /wp-json/wpgb/* REST API endpoints. …
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Same weakness CWE-269 – Improper Privilege Management
View allSame technique Privilege Escalation
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External POC / Exploit Code
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