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CVE-2026-18366 – Unauthenticated Privilege Escalation to Administrator – Events Manager WordPress Pl

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Summary

CVE-2026-18366 is an improper privilege management vulnerability in the Events Manager WordPress plugin. Unauthenticated attackers can change a user’s password, escalate an account to Administrator, or delete an account when the target user ID matches the ID of one of the plugin’s own posts. The issue is rated CRITICAL with a CVSS v3.1 base score of 9.8.

Technical details

  • Root cause: the plugin does not properly scope its capability mapping, discarding the access control decisions WordPress had already made for a given action.
  • Trigger condition: exploitation depends on an ID collision between a WordPress user ID and an Events Manager post ID; this collision can reportedly be forced on sites that expose guest booking functionality.
  • Attack vector: network-based, no authentication and no user interaction required (AV:N/AC:L/PR:N/UI:N).
  • Impact: full compromise of confidentiality, integrity, and availability — password changes, escalation to Administrator, or deletion of the affected account, potentially leading to complete site takeover.

Affected software

  • Events Manager WordPress plugin, versions 7.1 through versions prior to 7.4.1.

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: upgrade Events Manager to version 7.4.1 or later, which contains the fix.
  • If patching cannot be applied immediately: restrict or disable guest booking functionality to reduce the ability of an attacker to force the ID collision required for exploitation, and monitor for unexpected password changes, role escalations, or account deletions.

References

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