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Vulnerability record · CVE-2026-4431 · published 5 August 2026

CVE-2026-4431: Missing authorization vulnerability

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.

9.1 CVSS 3.1 Critical EPSS 0.62% · top 52.5% CWE-862 · Missing authorization Deferred
9.1CVSS 3.1 base score
0.62%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
12 Aug 2026Last modified by NVD

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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

References

LinkTags
https://plugins.trac.wordpress.org/browser/easy-post-submission/tags/2.2.0/includes/client-ajax-handler.php#L1157
https://plugins.trac.wordpress.org/browser/easy-post-submission/tags/2.2.0/includes/client-ajax-handler.php#L38
https://plugins.trac.wordpress.org/browser/easy-post-submission/tags/2.2.0/includes/client-ajax-handler.php#L974
https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&new=3488045%40easy-post-submission%2Ftrunk&
https://www.wordfence.com/threat-intel/vulnerabilities/id/15494ccf-7c9d-4566-9e80-2da94172a3dd?source=cve

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Source: NIST National Vulnerability Database (record CVE-2026-4431), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.