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CVE-2026-17153— AI Agent by SiteGround <= 1.2.7 - Missing Authorization to Authenticated (Contributor+) Arbitrary Media Upload via /generate-content REST Endpoint

Quick assessment

Affected
siteground AI Agent by SiteGround
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SiteGround 为 WordPress 开发的 AI Agent 插件存在授权绕过漏洞，影响所有 1.2.7 及以下版本。该漏洞源于插件未正确验证用户是否具有执行特定操作的权限。这使得未认证的攻击者能够将图片上传至 WordPress 媒体库，绕开了通常对贡献者（Contributor）角色施加的 能力限制。此外，具备贡献者及以上权限的已认证攻击者可以轻松满足该接口所需的 nonce 值和权限校验。由于插件将 颁发给所有拥有块编辑器访问权限的用户（包括贡献者），因此缺失对 能力的检查便成为攻击者利用该漏洞的唯

CVSS 5.3 · Medium EPSS 0.27% · P19

Affected Version Matrix 1

VendorProduct Version RangeStatus
siteground AI Agent by SiteGround ≤ 1.2.7 affected
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I. Basic Information for CVE-2026-17153

Vulnerability Information
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Vulnerability Title
AI Agent by SiteGround <= 1.2.7 - Missing Authorization to Authenticated (Contributor+) Arbitrary Media Upload via /generate-content REST Endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
siteground AI Agent by SiteGround 0 ~ 1.2.7 -

II. Public POCs for CVE-2026-17153

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III. Intelligence Information for CVE-2026-17153

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Patches & Fixes for CVE-2026-17153 (1)

Vendor Advisories for CVE-2026-17153 (1)

IV. Related Vulnerabilities

Same vendor: siteground
Same weakness: CWE-862

V. Comments for CVE-2026-17153

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