CVE-2026-4431 Easy Post Submission <= 2.3.0 - Missing Authorization
Unauthenticated attackers can modify arbitrary post content and unpublish posts due to missing capability checks in the Easy Post Submission plugin.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-4431?
CVE-2026-4431 is a critical missing authorization vulnerability in themeruby Easy Post Submission – Frontend Posting, Guest Publishing & Submit Content for WordPress, published on 5 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-862
Which versions are affected by CVE-2026-4431?
How do I fix CVE-2026-4431?
No fix has been published for CVE-2026-4431 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-4431 being exploited?
There is no known exploitation of CVE-2026-4431 in the wild and no public exploit code.
Sources
Also known as GHSA-hqvx-hxrc-x42r.