CVE-2026-17153
MediumCVSS 5.3Exploitation Probability (EPSS)
Low risk19th percentile - higher than 19% of all known CVEs
Summary
The AI Agent by SiteGround plugin for WordPress is vulnerable to authorization bypass in all versions up to and including 1.2.7. The plugin does not properly verify that a user is authorized to perform an action, allowing unauthenticated attackers to upload images to the WordPress media library, bypassing the upload_files capability restriction that Contributors are normally subject to. Authenticated attackers with Contributor-level access or above can satisfy the endpoint's nonce and permission checks.
Risk Assessment
Unauthorized file uploads can lead to media library clutter or enable further attacks such as injecting malicious content.
Recommendation
Update the AI Agent by SiteGround plugin to a version newer than 1.2.7 that includes the fix.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS