Easy Post Submission <= 2.3.0 - Missing Authorization
Strategic Overview
- Status
- Patched in 2.4.0
- Affected Plugin
- Easy Post Submission – Frontend Posting, Guest Publishing & Submit Content for WordPress
- Affected Version
<= 2.3.0- CVSS
- 9.1Critical
- Weakness type
- CWE-862 · Missing Authorization
- CVE
CVE-2026-4431
At a glance
CVE-2026-4431 is a critical-severity Missing Authorization vulnerability in the Easy Post Submission WordPress plugin, affecting versions <= 2.3.0. It carries a CVSS score of 9.1 (reachable over the network; low attack complexity; high integrity, availability impact). Exploitation requires no authentication. The issue is fixed in version 2.4.0; sites on affected versions should update now. Disclosed August 2026, reported by Md. Moniruzzaman Prodhan (NomanProdhan).
Vulnerability Overview
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.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user. A successful exploit has high impact on integrity, availability.
CWE-862: Missing Authorization
Easy Post Submission <= 2.3.0 carries this weakness at postId, and reaching it takes a caller who can reach the endpoint. A missing authorization check means a function is reachable by anyone who can reach the endpoint, because the code never asks whether the caller is allowed to perform the action.
Any user who can reach the endpoint gets to run an action reserved for higher-privileged roles, from reading protected data to changing settings or content. For Easy Post Submission the fix is 2.4.0: builds <= 2.3.0 are affected, anything from 2.4.0 onward is not.
Remediation
Update to version 2.4.0, or a newer patched version
How WordSec helps
Because it turns on account access, WordSec's login security is the relevant layer: role-based two-factor, captcha and brute-force limits raise the cost of getting the account this needs. None of that substitutes for the fix: Easy Post Submission 2.4.0 closes this, and updating the plugin is the step that ends it.
- Login Security
- Alerts
External References
Related records
Same weakness class
Other vulnerabilities in Easy Post Submission – Frontend Posting, Guest Publishing & Submit Content for WordPress
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