Booking calendar, Appointment Booking System <= 3.2.36 — Missing Authorization to Unauthenticated Arbitrary Modification via wpdevart_payment AJAX Action
CVE-2026-8840Published · Updated Action summary
Affected: ≤3.2.36No patch available
What to do until a fix ships- Severity
- Medium5.3
- CVSS
- 5.3CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:NWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:NPrivileges required- None
UI:NUser interaction- None
S:UScope- Unchanged
C:NConfidentiality- None
I:LIntegrity- Low
A:NAvailability- None
- Weakness
- CWE-862 Missing Authorization
- Required access
- No account needed
- Exploit prediction (EPSS)
- No score
- CISA KEV
- Not listed
On this page8
Am I affected?
Booking calendar, Appointment Booking System booking-calendar
- Affected≤ 3.2.36
- PatchedNo fix yet
No patched version available.
You are affected if you run ≤ 3.2.36. No fixed version has been released.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Booking calendar, Appointment Booking System.
- No admin access? Run a passive check of your site. It reads public files only.
- No account is needed to exploit this. Treat any exposed site on an affected version as at risk.
What to do
- No known patch available. Please review the vulnerability's details in depth and employ mitigations based on your organization's risk tolerance. It may be best to uninstall the affected software and find a replacement.
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch Booking calendar, Appointment Booking System to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to Raihan Adi Arba.
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.
Exploits & references
Proof-of-concept & detection
No public proof-of-concept or detection template is known for this vulnerability.
Advisories & patches
- Advisorywordfence.com
Related CVEs
More in Booking calendar, Appointment Booking System
All 23| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium5.3 | Unauthenticated Insecure Direct Object Reference ≤3.2.36No patch available | CVE-2026-73395 | |
| High7.2 | Unauthenticated Stored Cross-Site Scripting ≤3.2.36No patch available | CVE-2026-14334 | |
| Medium5.3 | Missing Authorization ≤3.2.36No patch available | CVE-2026-57778 | |
| High7.2 | Unauthenticated Stored Cross-Site Scripting ≤3.2.36No patch available | CVE-2026-25435 | |
| Medium5.3 | Missing Authorization ≤3.2.30Update to 3.2.31 | CVE-2025-67574 |
- Medium5.3Unauthenticated Insecure Direct Object Reference
≤3.2.36No patch available
- High7.2Unauthenticated Stored Cross-Site Scripting
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- Medium5.3Missing Authorization
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- High7.2Unauthenticated Stored Cross-Site Scripting
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- Medium5.3Missing Authorization
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Same weakness (Missing Authorization)
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Timeline
CVE published
Severity medium, CVSS 5.3
Record last updated
Sources & licenses
Wordfence record- Vulnerability data
- Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
- CVE® identifiers
- Copyright 1999-2026 The MITRE Corporation. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
- CVSS / CWE
- National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.