CVE-2026-4431
Received Received - Intake

Unauthenticated Post Modification in Easy Post Submission WordPress Plugin

Publication date: 2026-08-05

Last updated on: 2026-08-05

Assigner: Wordfence

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.

CVSS Scores

EPSS Scores

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Meta Information

Published
2026-08-05
Last Modified
2026-08-05
Generated
2026-08-05
AI Q&A
2026-08-05
EPSS Evaluated
N/A
NVD
CVE-2026-4431
EUVD
EUVD-2026-53285

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
easy_post_submission plugin to 2.3.0 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-862 The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

Attack-Flow Graph

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Executive Summary

The Easy Post Submission WordPress plugin up to version 2.3.0 allows unauthenticated users to modify posts via the rbsm_submit_post AJAX action. The vulnerability exists because the plugin registers this action for unauthenticated users without proper authorization checks. Attackers can change post titles, content, excerpts, categories, tags, and even unpublish posts by supplying a postId parameter.

Detection Guidance

Check WordPress sites using the Easy Post Submission plugin version 2.3.0 or lower. Look for unauthorized post modifications or changes to post status. Review server logs for suspicious AJAX requests to 'wp_ajax_nopriv_rbsm_submit_post' with a 'postId' parameter.

Impact Analysis

This vulnerability allows attackers to modify or unpublish any post on your WordPress site without authentication. They could alter content, change post status to draft, or manipulate metadata. This could damage your site's integrity, mislead visitors, or disrupt operations. The high CVSS score indicates significant risk of unauthorized data manipulation.

Compliance Impact

This vulnerability could lead to unauthorized modification of sensitive content, potentially violating integrity requirements in GDPR and HIPAA. If personal data in posts is altered without authorization, it may constitute a data breach under these regulations, requiring notification and potential fines.

Mitigation Strategies

Update the Easy Post Submission plugin to the latest version. If no update is available, disable or remove the plugin immediately. Implement strict access controls to prevent unauthenticated AJAX requests. Monitor posts for unauthorized changes.

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