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CVE-2026-4431— Easy Post Submission <= 2.3.0 - Missing Authorization

Quick assessment

Affected
themeruby Easy Post Submission – Frontend Posting, Guest Publishing & Submit Content for 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 Easy Post Submission是WordPress基金会开源的一款简化文章提交流程的CMS插件。 WordPress Easy Post Submission 2.3.0及之前版本存在授权问题漏洞，该漏洞源于create_post()函数缺少能力检查，可能导致未经身份验证的攻击者通过postId参数修改任意文章标题、内容、摘要、分类和标签，并将文章状态改为草稿（取消发布）。

CVSS 9.1 · Critical EPSS 0.33% · P26

Affected Version Matrix 1

VendorProduct Version RangeStatus
themeruby Easy Post Submission – Frontend Posting, Guest Publishing & Submit Content for WordPress ≤ 2.3.0 affected
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I. Basic Information for CVE-2026-4431

Vulnerability Information
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Vulnerability Title
Easy Post Submission <= 2.3.0 - Missing Authorization
Source: CVE Program / CVE List V5
Vulnerability Description
The Easy Post Submission plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the `create_post()` function in all versions up to, and including, 2.3.0. This is due to the `rbsm_submit_post` AJAX action being registered for unauthenticated users via `wp_ajax_nopriv_rbsm_submit_post` without any authorization checks when a `postId` parameter is supplied. This makes it possible for unauthenticated attackers to modify the title, content, excerpt, categories, and tags of arbitrary posts, as well as change the post status to draft (effectively unpublishing them) via the 'postId' parameter.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress Easy Post Submission 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress Easy Post Submission是WordPress基金会开源的一款简化文章提交流程的CMS插件。 WordPress Easy Post Submission 2.3.0及之前版本存在授权问题漏洞，该漏洞源于create_post()函数缺少能力检查，可能导致未经身份验证的攻击者通过postId参数修改任意文章标题、内容、摘要、分类和标签，并将文章状态改为草稿（取消发布）。
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
themeruby Easy Post Submission – Frontend Posting, Guest Publishing & Submit Content for WordPress 0 ~ 2.3.0 -

II. Public POCs for CVE-2026-4431

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III. Intelligence Information for CVE-2026-4431

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Patches & Fixes for CVE-2026-4431 (3)

Security Blog Posts for CVE-2026-4431 (1)

IV. Related Vulnerabilities

Same vendor: themeruby
Same weakness: CWE-862

V. Comments for CVE-2026-4431

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