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.
CVSS Score
CRITICAL
Related Weaknesses (CWE)
References
- https://plugins.trac.wordpress.org/browser/easy-post-submission/tags/2.2.0/inclu
- https://plugins.trac.wordpress.org/browser/easy-post-submission/tags/2.2.0/inclu
- https://plugins.trac.wordpress.org/browser/easy-post-submission/tags/2.2.0/inclu
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&new
- https://www.wordfence.com/threat-intel/vulnerabilities/id/15494ccf-7c9d-4566-9e8
FAQ
What is CVE-2026-4431?
CVE-2026-4431 is a vulnerability with a CVSS score of 9.1 (CRITICAL). 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,...
How severe is CVE-2026-4431?
CVE-2026-4431 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-4431?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.