EUVD-2026-63200
GHSA-qg2p-54pj-chvp
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Nonce is issued only to authenticated block-editor users (Contributors+), making PR:L more accurate than the assigned PR:N; impact is integrity-only via media library write.
Primary rating from Vendor (Wordfence).
CVSS VectorVendor: Wordfence
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
Unauthorized file upload in the AI Agent by SiteGround WordPress plugin (all versions through 1.2.7) allows attackers to inject arbitrary images into the WordPress media library by exploiting a missing upload_files capability check in the plugin's REST API endpoint. The endpoint's nonce (sg_ai_studio_gutenberg_nonce) is broadcast to all users with block editor access - including Contributors - making the absent capability check the sole enforcement barrier. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the sg-ai-studio plugin to be installed and active on the target WordPress site. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The official CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N, score 5.3) rates this as network-exploitable with no privileges required. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upstream fix available (changeset 3654622 in the WordPress plugin repository at https://plugins.trac.wordpress.org/changeset?reponame=&old=3654622%40sg-ai-studio&new=3654622%40sg-ai-studio); a released patched version number is not explicitly confirmed in the available input data - users should update to the latest version available in the WordPress plugin directory and verify the changelog confirms the authorization fix. … Detailed patch versions, workarounds, and compensating controls in full report. |
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