WP Booking System <= 2.1.0.5 — Missing Authorization to Unauthenticated Arbitrary Calendar Note Deletion via wpbs_calendar_remove_note AJAX Action
CVE-2026-116557Published · Updated Action summary
Affected: ≤2.1.0.5Update to 2.1.0.6 or newer
All remediation steps- Severity
- Critical9.1
- CVSS
- 9.1CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:HWhat 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:HIntegrity- High
A:HAvailability- High
- Weakness
- CWE-862 Missing Authorization
- Required access
- No account needed
- Exploit prediction (EPSS)
- 0.3% chance in 30 days28th percentile
- CISA KEV
- Not listed
On this page8
Am I affected?
WP Booking System – Booking Calendar wp-booking-system
- Affected≤ 2.1.0.5
- Patched in2.1.0.6
Update to 2.1.0.6 or newer.
You are affected if you run ≤ 2.1.0.5. Version 2.1.0.6 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under WP Booking System – Booking Calendar.
- 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
- Update to version 2.1.0.6, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch WP Booking System – Booking Calendar to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to Mohamed Amgad Khater (mamgad).
The WP Booking System - Booking Calendar plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the wpbs_action_ajax_calendar_remove_note() function in versions up to, and including, 2.1.0.5 This makes it possible for authenticated attackers, with Subscriber-level access and above, to delete arbitrary calendar notes belonging to any calendar.
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 WP Booking System – Booking Calendar
All 17| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| High7.2 | Unauthenticated Stored Cross-Site Scripting ≤2.1.0.6Update to 2.1.0.7 | CVE-2026-57639 | |
| Medium6.1 | Reflected Cross-Site Scripting ≤2.1.0.2Update to 2.1.0.3 | CVE-2026-109147 | |
| Medium6.8 | Missing Authorization to Authenticated (Subscriber+) Privilege Escalation via 'user_permission' Parameter via Cross-Form Nonce Reuse ≤2.1.0.3Update to 2.1.0.4 | CVE-2026-109369 | |
| Medium6.5 | Missing Authorization to Authenticated (Subscriber+) Sensitive Information Exposure via wpbs_refresh_calendar_editor AJAX action ≤2.1.0.3Update to 2.1.0.4 | CVE-2026-109368 | |
| High7.5 | Missing Authorization to Unauthenticated Sensitive Information Disclosure via 'wpbs_action=email_logs' Action ≤2.1.0.3Update to 2.1.0.4 | CVE-2026-108123 |
- High7.2Unauthenticated Stored Cross-Site Scripting
≤2.1.0.6Update to 2.1.0.7
- Medium6.1Reflected Cross-Site Scripting
≤2.1.0.2Update to 2.1.0.3
- Medium6.8Missing Authorization to Authenticated (Subscriber+) Privilege Escalation via 'user_permission' Parameter via Cross-Form Nonce Reuse
≤2.1.0.3Update to 2.1.0.4
- Medium6.5Missing Authorization to Authenticated (Subscriber+) Sensitive Information Exposure via wpbs_refresh_calendar_editor AJAX action
≤2.1.0.3Update to 2.1.0.4
- High7.5Missing Authorization to Unauthenticated Sensitive Information Disclosure via 'wpbs_action=email_logs' Action
≤2.1.0.3Update to 2.1.0.4
Same weakness (Missing Authorization)
All Missing Authorization| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| High7.2 | Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header | CVE-2026-120688 | |
| Critical9.8 | Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission | CVE-2026-125055 | |
| Critical9.8 | Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter | CVE-2026-119077 | |
| Medium5.3 | Unauthenticated Sensitive Information Exposure in 'search' Parameter | CVE-2026-121518 |
- High7.2Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header
EZ SQL Reports Shortcode Widget and DB Backup
≤5.25.25Update to 5.26.45
- Critical9.8Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission
Chatterbug Forms – Fast, Flexible WordPress Form Builder
≤1.0.2Update to 1.1
- Critical9.8Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter
ELEX WordPress HelpDesk & Customer Ticketing System
≤3.3.9Update to 3.4.0
- Medium5.3Unauthenticated Sensitive Information Exposure in 'search' Parameter
Customer Reviews for WooCommerce
≤5.127.0Update to 5.128.0
Timeline
CVE published
Severity critical, CVSS 9.1
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.
- EPSS
- Exploit Prediction Scoring System by FIRST.org.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.