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CVE-2026-3906— WordPress 6.9 - 6.9.1 - Missing Authorization to Authenticated (Subscriber+) Arbitrary Note Creation via REST API

Quick assessment

Affected
WordPress Foundation WordPress
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.

WordPress和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin core 6.9至6.9.1版本存在安全漏洞，该漏洞源于comments控制器中create_item_permissions_check方法未验证用户编辑权限，可能导致具有订阅者级别访问权限的经过身份验证的攻击者在

CVSS 4.3 · Medium EPSS 0.41% · P34
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I. Basic Information for CVE-2026-3906

Vulnerability Information
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Vulnerability Title
WordPress 6.9 - 6.9.1 - Missing Authorization to Authenticated (Subscriber+) Arbitrary Note Creation via REST API
Source: CVE Program / CVE List V5
Vulnerability Description
WordPress core is vulnerable to unauthorized access in versions 6.9 through 6.9.1. The Notes feature (block-level collaboration annotations) was introduced in WordPress 6.9 to allow editorial comments directly on posts in the block editor. However, the REST API `create_item_permissions_check()` method in the comments controller did not verify that the authenticated user has `edit_post` permission on the target post when creating a note. This makes it possible for authenticated attackers with Subscriber-level access to create notes on any post, including posts authored by other users, private posts, and posts in any status.
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
WordPress plugin core 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin core 6.9至6.9.1版本存在安全漏洞，该漏洞源于comments控制器中create_item_permissions_check方法未验证用户编辑权限，可能导致具有订阅者级别访问权限的经过身份验证的攻击者在
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
WordPress Foundation WordPress 6.9 ~ 6.9.1 -

II. Public POCs for CVE-2026-3906

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III. Intelligence Information for CVE-2026-3906

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Patches & Fixes for CVE-2026-3906 (1)

Vendor Pages for CVE-2026-3906 (1)

IV. Related Vulnerabilities

Same product: WordPress
Same vendor: WordPress Foundation
Same weakness: CWE-862

V. Comments for CVE-2026-3906

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