What is the CVSS score of EUVD-2026-36856?

EUVD-2026-36856 has a CVSS 3.1 base score of 9.1 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N. EPSS exploitation probability: 0.3%.

Which versions of TrueBooker are affected by EUVD-2026-36856?

The TrueBooker WordPress appointment-booking plugin (versions ≤1.1.9) contains a critical unauthenticated access control flaw that exposes booking data and allows attackers to modify appointment…

How to fix or mitigate EUVD-2026-36856?

Within 24 hours: Verify whether TrueBooker ≤1.1.9 is installed in production and assess criticality of appointment-booking functionality. Within 7 days: If installed, apply interim mitigations (see compensating controls) and contact ThemeTechMount for security update timeline. Within 30 days: Upgrade to a patched version when released by vendor, or migrate to an alternative booking solution with demonstrated security practices.

TrueBooker EUVD-2026-36856

| CVE-2026-48881 CRITICAL

Missing Authorization (CWE-862)

2026-06-15 Patchstack

GHSA-cwvg-5ch6-2hq6

Authentication Bypass Truebooker

9.1

CVSS 3.1 · Vendor: Patchstack

Severity by source

Vendor (Patchstack) PRIMARY

9.1 CRITICAL

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

vuln.today AI

9.1 CRITICAL

Unauthenticated remote HTTP request to a WordPress plugin endpoint (AV:N/AC:L/PR:N/UI:N); missing authorization exposes and mutates booking data (C:H/I:H) but no availability impact stated (A:N).

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

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

Primary rating from Vendor (Patchstack).

CVSS VectorVendor: Patchstack

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Lifecycle Timeline

Analysis Generated

Jun 15, 2026 - 21:46 vuln.today

DescriptionCVE.org

Unauthenticated Broken Access Control in TrueBooker <= 1.1.9 versions.

AnalysisAI

Unauthenticated broken access control in the TrueBooker WordPress appointment-booking plugin (versions ≤ 1.1.9 by ThemeTechMount) allows remote attackers without credentials to invoke privileged plugin functionality that should be restricted, exposing booking data and permitting unauthorized state changes. The flaw is tracked by Patchstack and rated CVSS 9.1 with network attack vector and no privileges or user interaction required; no public exploit identified at time of analysis and the issue is not currently listed in CISA KEV.

Technical ContextAI

TrueBooker is a commercial WordPress appointment-booking plugin distributed by ThemeTechMount (CPE cpe:2.3:a:themetechmount:truebooker). The root cause is CWE-862 (Missing Authorization): one or more plugin AJAX/REST endpoints execute sensitive booking-management actions without performing the required capability checks (e.g., current_user_can) or nonce-bound authorization. In typical WordPress plugin patterns this means the handler is wired through wp_ajax_nopriv_ or an unauthenticated rest_api_init route, so requests are processed before any access-control gate is applied.

RemediationAI

Upgrade TrueBooker to a version greater than 1.1.9 once ThemeTechMount publishes a fixed release - the Patchstack record at https://patchstack.com/database/wordpress/plugin/truebooker-appointment-booking/vulnerability/wordpress-truebooker-plugin-1-1-9-broken-access-control-vulnerability is the canonical reference and should be checked for the patched version. Until a patched build is confirmed, deactivate the TrueBooker plugin if appointment booking is non-essential (side effect: booking functionality offline); alternatively, restrict access to the WordPress admin-ajax.php and /wp-json/ endpoints exposed by the plugin using a WAF rule or Patchstack/Wordfence virtual patch, accepting that broad rules may block legitimate AJAX traffic for other plugins. Disabling unauthenticated REST API access site-wide is another option but will break logged-out features of other plugins and themes.