Missing authorization in wpdevart Booking calendar, Appointment Booking System
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-862.
Summary
The Booking calendar, Appointment Booking System plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 3.2.36. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for unauthenticated attackers to mark arbitrary reservations as paid or completed, cancel legitimate payments, auto-approve reservations, and trigger transactional booking emails by writing attacker-supplied payment status and transaction data directly into the payments table. The auto-approval of reservations is only triggered when the 'enable_psuccess_approval' site option is enabled, but payment status manipulation and email dispatch are exploitable regardless of that setting.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-8840
- 2026-10-03 Alias added: GHSA-g8cr-48gj-g988
References
Other 9
- https://www.wordfence.com/threat-intel/vulnerabilities/id/88409bb0-5cb0-4f63-b8f0-d72f54fa17b0?source=cve
- https://plugins.trac.wordpress.org/browser/booking-calendar/tags/3.2.36/admin/controllers/Payment.php#L26
- https://plugins.trac.wordpress.org/browser/booking-calendar/tags/3.2.36/admin/controllers/Payment.php#L16
- https://plugins.trac.wordpress.org/browser/booking-calendar/tags/3.2.36/booking_calendar.php#L578
- https://plugins.trac.wordpress.org/browser/booking-calendar/tags/3.2.36/booking_calendar.php#L131
- https://plugins.trac.wordpress.org/browser/booking-calendar/tags/3.2.35/admin/controllers/Payment.php#L26
- https://plugins.trac.wordpress.org/browser/booking-calendar/tags/3.2.35/admin/controllers/Payment.php#L16
- https://plugins.trac.wordpress.org/browser/booking-calendar/tags/3.2.35/booking_calendar.php#L578
- https://plugins.trac.wordpress.org/browser/booking-calendar/tags/3.2.35/booking_calendar.php#L131
More wpdevart vulnerabilities
- TI-2022-03651 Booking Calendar < 3.2.2 - Unauthenticated Arbitrary File Upload CVSS 3.1CRITICAL 9.8
- TI-2021-06732 Poll, Survey, Questionnaire and Voting system < 1.5.3 - Unauthenticated Blind SQL Injection CVSS 3.1CRITICAL 9.8
- TI-2023-00852 AP Pricing Tables Lite <= 1.1.6 - Admin+ SQLi CVSS 3.1HIGH 7.2
- TI-2023-00171 Social Like Box and Page by WpDevArt < 0.8.41 - Contributor+ Stored XSS CVSS 3.1MEDIUM 5.4
- TI-2022-26411 WordPress Contact Form Builder 1.6.1 Cross-Site Scripting via code_generator.php CVSS 4.0MEDIUM 5.1
- TI-2022-23505 WordPress Booking calendar, Appointment Booking System Plugin <= 3.2.7 is vulnerable to SQL Injection CVSS 3.1CRITICAL 9.8
Sources
- CVE-2026-8840 · CVE Program
- CVE-2026-8840 · NVD
- FIRST EPSS
- GHSA-g8cr-48gj-g988 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences