CVE-2026-4431: Themeruby Easy Post Submission – Frontend Posting, Guest Publishing & Submit Content For WordPress

Critical severity, CVSS 9.1. EPSS: 0.6% chance of exploitation in the next 30 days.

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.

Affected products

• Themeruby Easy Post Submission – Frontend Posting, Guest Publishing & Submit Content For WordPress: up to and including 2.3.0

Published 2026-08-05. Last modified 2026-08-12.