Vulnerability Description
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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://plugins.trac.wordpress.org/browser/wpjam-basic/trunk/includes/class-wpja
- https://plugins.trac.wordpress.org/browser/wpjam-basic/trunk/includes/class-wpja
- https://plugins.trac.wordpress.org/browser/wpjam-basic/trunk/includes/class-wpja
- https://plugins.trac.wordpress.org/browser/wpjam-basic/trunk/includes/class-wpja
- https://wordpress.org/plugins/wpjam-basic/
- https://www.wordfence.com/threat-intel/vulnerabilities/id/77464287-bbaa-428e-929
FAQ
What is CVE-2026-103900?
CVE-2026-103900 is a vulnerability with a CVSS score of 8.1 (HIGH). 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 `da...
How severe is CVE-2026-103900?
CVE-2026-103900 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-103900?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.