What is the CVSS score of CVE-2026-39587?

CVE-2026-39587 has a CVSS 3.1 base score of 8.1 (High). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.3%.

Which versions of WP BASE Booking are affected by CVE-2026-39587?

WP BASE Booking WordPress plugin (versions through 5.9.0) contains an unauthenticated privilege escalation vulnerability (CVSS 8.1) allowing attackers to fully compromise affected WordPress…

How to fix or mitigate CVE-2026-39587?

Within 24 hours: Identify all WordPress installations using WP BASE Booking plugin (versions ≤5.9.0); document inventory with deployed versions and criticality. Within 7 days: Deactivate and remove WP BASE Booking plugin from all production WordPress sites; implement network access controls to restrict unauthenticated connections to plugin endpoints. Within 30 days: Monitor vendor security advisory for patch release; evaluate alternative booking solutions if no patch becomes available; deploy Web Application Firewall rules targeting the plugin if removal is not feasible.

WP BASE Booking CVE-2026-39587

EUVD-2026-36968 HIGH

Incorrect Privilege Assignment (CWE-266)

2026-06-15 Patchstack

GHSA-23mx-4w8p-jgwp

WordPress Privilege Escalation Wordpress Plugin Wp Base Booking Hakan Ozevin

8.1

CVSS 3.1 · Vendor: Patchstack

Severity by source

Vendor (Patchstack) PRIMARY

8.1 HIGH

AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

vuln.today AI

8.1 HIGH

Network-reachable WordPress endpoint, no authentication or user interaction, full site takeover impacts CIA; AC:H reflects an undisclosed non-trivial precondition noted by Patchstack.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

4.0 AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (Patchstack).

CVSS VectorVendor: Patchstack

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Jun 15, 2026 - 22:16 vuln.today

DescriptionCVE.org

Unauthenticated Privilege Escalation in WP BASE Booking <= 5.9.0 versions.

AnalysisAI

Unauthenticated privilege escalation in the WP BASE Booking WordPress plugin (versions through 5.9.0) allows remote attackers to elevate privileges without credentials, with potential to fully compromise affected WordPress sites. The flaw is rated CVSS 8.1 (high) with no public exploit identified at time of analysis, but the unauthenticated nature and high impact on confidentiality, integrity, and availability make it a notable risk for sites running the plugin.

Technical ContextAI

WP BASE Booking (CPE cpe:2.3:a:hakan_ozevin:wp_base_booking) is a WordPress plugin for booking appointments, services, and events. The root cause is classified as CWE-266 (Incorrect Privilege Assignment), meaning the plugin grants a user a privilege level - or accepts an action - that should be restricted to higher-privileged roles. In WordPress plugins this class of bug typically arises from missing capability checks (current_user_can) or unauthenticated AJAX/REST endpoints that perform privileged actions such as role assignment, user creation, or option updates without verifying the caller's role.

RemediationAI

No vendor-released patch identified at time of analysis from the provided data - the Patchstack advisory lists affected versions as ≤5.9.0 but does not confirm a fixed release in the inputs supplied. Site operators should consult the Patchstack advisory at https://patchstack.com/database/wordpress/plugin/wp-base-booking-of-appointments-services-and-events/vulnerability/wordpress-wp-base-booking-plugin-5-9-0-privilege-escalation-vulnerability for the latest fix status and upgrade to any version greater than 5.9.0 once released. As compensating controls until a patch is applied, deactivate the WP BASE Booking plugin (which will disable booking functionality on the site), or place the WordPress admin and plugin AJAX/REST endpoints (/wp-admin/admin-ajax.php, /wp-json/) behind a WAF rule or virtual patch from Patchstack/Wordfence that blocks anonymous requests targeting the plugin's namespace, accepting that overly broad rules may break legitimate front-end booking flows.