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CVE-2026-103900 – Unauthenticated Privilege Escalation – WPJAM Basic WordPress Plugin <= 7.1

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Summary

CVE-2026-103900 is an unauthenticated privilege escalation vulnerability (CWE-269, Improper Privilege Management) in the WPJAM Basic WordPress plugin. An unauthenticated attacker can create an administrator account when social login is enabled. The CVSS v3.1 base score is 8.1 (High).

Technical details

  • Root cause: WPJAM_User_Signup::signup() unpacks attacker-supplied data[args] from the AJAX POST body. The role parameter is preserved before the user is created.
  • Trigger conditions: the social login feature must be enabled. The attack complexity is rated High in the CVSS vector.
  • Attack vector: network. No authentication or user interaction is required.
  • Impact: an attacker can create an account with the administrator role. This can lead to full compromise of the WordPress site (high confidentiality, integrity and availability impact).

Affected software

  • WPJAM Basic WordPress plugin: all versions through 7.1

Severity

  • CVSS v3.1 base score: 8.1 (High)
  • Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: the CVE record does not specify a fixed version. Check the plugin page on WordPress.org for a patched release newer than 7.1 and upgrade as soon as one is available.
  • If no patch is available: disable the social login feature, or deactivate and remove the plugin. Review the site’s user list for unexpected administrator accounts.

References

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