CVE-2026-104748 Privilege escalation in SimpleForm – Form Maker to Chat Apps with Quiz, Poll and Multi Lead Notifications
Unauthenticated attackers can escalate privileges to Administrator by exploiting mass assignment in the SimpleForm WordPress plugin registration endpoint.
- 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-2026-104748?
CVE-2026-104748 is a critical vulnerability in wpazleen SimpleForm – Form Maker to Chat Apps with Quiz, Poll and Multi Lead Notifications, published on 14 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The SimpleForm – Form Maker to Chat Apps with Quiz, Poll and Multi Lead Notifications plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 3.10.0 This is due to the `wp_ajax_nopriv_simpleform_wp_register` AJAX action lacking any capability check for role assignment and the `save_custom_fields_to_user_meta()` function using an exclusion list that omits `wp_capabilities`, combined with `get_form_settings()` returning a hard-coded defaults array that unconditionally enables meta writing regardless of the supplied `form_id`. This makes it possible for unauthenticated attackers to create a new Administrator-level WordPress account by supplying `wp_capabilities[administrator]=1` alongside standard registration fields. The nonce required by the endpoint is publicly emitted into the `front_end_data` JavaScript object on every front-end page via `wp_enqueue_scripts`, making it trivially obtainable by any unauthenticated visitor before submitting the malicious request.
Weakness: CWE-269
Which versions are affected by CVE-2026-104748?
How do I fix CVE-2026-104748?
No fix has been published for CVE-2026-104748 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-104748 being exploited?
There is no known exploitation of CVE-2026-104748 in the wild and no public exploit code.
Public exploit code: 2 proofs of concept on GitHub.
Sources
Also known as GHSA-5hqh-jvjf-mpvw.