CVE-2026-39587 is an unauthenticated privilege escalation vulnerability affecting WP BASE Booking versions up to 5.9.0. The issue arises from incorrect privilege assignment (CWE-266), enabling attackers without authentication to gain elevated privileges. The CVSS v3.1 base score is 8.1, indicating high severity with network attack vector, high attack complexity, no privileges required, no user interaction, and impacts on confidentiality, integrity, and availability. No vendor advisory or patch information is currently available, and no known exploits in the wild have been reported.

Successful exploitation allows an unauthenticated attacker to escalate privileges within the WP BASE Booking plugin, potentially leading to full compromise of the affected system's confidentiality, integrity, and availability.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict access to the affected plugin and monitor for suspicious activity related to privilege escalation attempts.