What the vulnerability does
01Description
The AI Agent by SiteGround plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 1.2.7. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for unauthenticated attackers to upload images to the WordPress media library, bypassing the upload_files capability restriction that Contributors are normally subject to, as authenticated attackers with Contributor-level access or above can satisfy the endpoint's nonce and permission checks. The sg_ai_studio_gutenberg_nonce required by the endpoint is emitted to any user with block editor access — including Contributors — making the absent upload_files check the sole barrier to exploitation.
Explanation of Vulnerability in Simple Terms
02Summary
The AI Agent by SiteGround versions 1.2.7 and earlier lack proper authorization checks, allowing unauthenticated attackers to modify data on affected sites. An attacker can send network requests without credentials to trigger unauthorized changes. This affects the integrity of site content or configuration but does not expose sensitive information or cause downtime.
What an attacker can do
03Attacker Capabilities
Modify site data or configuration without authentication.
Potential impact on your site
04Site Impact
Unauthorized changes to site content, settings, or data integrity without your knowledge or consent.
Conditions required to exploit
05Prerequisites
Network access to the affected site; no authentication or user interaction required.
Key dates
06Disclosure timeline
August 20, 2026
CVE published
