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CVE-2026-12902— Kadence Blocks <= 3.7.7 - Missing Authorization to Authenticated (Contributor+) Arbitrary Media Attachment Creation via kadence_import_process_pattern/kadence_import_process_data AJAX Actions

Quick assessment

Affected
stellarwp Kadence Blocks — Page Builder Toolkit for Gutenberg Editor
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.

Nexcess Kadence Blocks是Nexcess公司的一款构建网站内容的框架。 Nexcess Kadence Blocks 3.7.7及之前版本存在授权问题漏洞，该漏洞源于插件未正确验证用户授权执行操作，可能导致经过身份验证的攻击者（具有贡献者级别及以上访问权限）通过wp_upload_bits()和wp_insert_attachment()下载远程图像到站点上传目录，从而创建任意媒体库附件，绕过upload_files能力边界。

CVSS 4.3 · Medium EPSS 0.47% · P39

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 1

VendorProduct Version RangeStatus
stellarwp Kadence Blocks — Page Builder Toolkit for Gutenberg Editor ≤ 3.7.7 affected
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I. Basic Information for CVE-2026-12902

Vulnerability Information
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Vulnerability Title
Kadence Blocks <= 3.7.7 - Missing Authorization to Authenticated (Contributor+) Arbitrary Media Attachment Creation via kadence_import_process_pattern/kadence_import_process_data AJAX Actions
Source: CVE Program / CVE List V5
Vulnerability Description
The Kadence Blocks — Page Builder Toolkit for Gutenberg Editor plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 3.7.7. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for authenticated attackers, with contributor-level access and above, to create arbitrary Media Library attachments by downloading remote images to the site's uploads directory via wp_upload_bits() and wp_insert_attachment(), bypassing the upload_files capability boundary.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/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
Vulnerability Title
Nexcess Kadence Blocks 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nexcess Kadence Blocks是Nexcess公司的一款构建网站内容的框架。 Nexcess Kadence Blocks 3.7.7及之前版本存在授权问题漏洞，该漏洞源于插件未正确验证用户授权执行操作，可能导致经过身份验证的攻击者（具有贡献者级别及以上访问权限）通过wp_upload_bits()和wp_insert_attachment()下载远程图像到站点上传目录，从而创建任意媒体库附件，绕过upload_files能力边界。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
stellarwp Kadence Blocks — Page Builder Toolkit for Gutenberg Editor 0 ~ 3.7.7 -

II. Public POCs for CVE-2026-12902

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III. Intelligence Information for CVE-2026-12902

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Patches & Fixes for CVE-2026-12902 (1)

Vendor Advisories for CVE-2026-12902 (1)

Same Patch Batch · stellarwp · 2026-07-01 · 4 CVEs total

CVE-2026-13246 6.4 MEDIUM GiveWP <= 4.16.0 - Authenticated (Author+) Stored Cross-Site Scripting via 'block_id' Shor
CVE-2026-11981 4.3 MEDIUM GiveWP <= 4.15.3 - Cross-Site Request Forgery
CVE-2026-12904 4.3 MEDIUM Kadence Blocks <= 3.7.7 - Insecure Direct Object Reference to Authenticated (Contributor+)

IV. Related Vulnerabilities

Same product: Kadence Blocks — Page Builder Toolkit for Gutenberg Editor
Same vendor: stellarwp
Same weakness: CWE-862

V. Comments for CVE-2026-12902

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