---
id: "CVE-2026-103900"
page: "https://infrastack.ai/live/CVE-2026-103900"
kind: "vulnerability"
aliases: ["CVE-2026-103900"]
title: "WPJAM Basic WordPress plugin: unauthenticated signup can create Administrator accounts"
severity: "high"
cvss: 8.1
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["package", "self-hosted", "wordpress", "wpjam-basic"]
not_affected_if: ["no-social-login-provider", "plugin-not-installed", "registration-closed"]
published_at: "2026-11-07T10:17:05+00:00"
first_seen_at: "2026-11-07T10:46:39+00:00"
updated_at: "2026-11-07T10:48:20+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-103900", "first_seen_at": "2026-11-07T10:46:39+00:00"}]
exploit_sources: []
---

# WPJAM Basic WordPress plugin: unauthenticated signup can create Administrator accounts

Link for people: https://infrastack.ai/live/CVE-2026-103900 (this .md is for agents)

The WPJAM Basic plugin for WordPress lets an unauthenticated visitor supply a user role during social-login signup, so the new account can be created as Administrator. An attacker who gets this gains full control of the WordPress site.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check whether the WPJAM Basic plugin is installed and at what version (plugin list in the WordPress admin, or `wp plugin list` with WP-CLI).
- Check whether a social-login provider is registered and open user registration is enabled in WordPress settings (Settings > General > Membership).
- Review recently created Administrator accounts for unknown users.

## Fix

- WPJAM Basic: unknown (no fixed version is stated in the sources).

## Timeline

- 2026-11-07T10:46:39+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-103900

## From the sources

The WPJAM Basic plugin for WordPress is vulnerable to Privilege Escalation in versions up to, and including, 7.1 This is due to the WPJAM_User_Signup::signup() function unpacking attacker-supplied `data[args]` from the AJAX POST body and merging it via PHP array union into the payload passed to WPJAM_User::create(), whose internal whitelist (wpjam_pick) explicitly preserves the `role` key before it is handed to wp_insert_user(). The endpoint is registered as wp_ajax_nopriv_{provider}-signup with a nonce that is emitted on the public login page. This makes it possible for unauthenticated attackers to elevate their privileges to Administrator by creating a new user with an attacker-chosen role, provided a social-login provider is registered and open registration is enabled.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_