Appointment Booking Calendar <= 1.4.01 — Authenticated (Contributor+) Sensitive Information Exposure via 'id' Parameter
CVE-2026-12111Published · Updated Action summary
Affected: ≤1.4.01Update to 1.4.02 or newer
All remediation steps- Severity
- Medium4.3
- CVSS
- 4.3CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:NWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:LPrivileges required- Low
UI:NUser interaction- None
S:UScope- Unchanged
C:LConfidentiality- Low
I:NIntegrity- None
A:NAvailability- None
- Weakness
- CWE-200 Information Exposure
- Required access
- Unknown
- Exploit prediction (EPSS)
- No score
- CISA KEV
- Not listed
On this page8
Am I affected?
Appointment Booking Calendar appointment-booking-calendar
- Affected≤ 1.4.01
- Patched in1.4.02
Update to 1.4.02 or newer.
You are affected if you run ≤ 1.4.01. Version 1.4.02 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Appointment Booking Calendar.
- No admin access? Run a passive check of your site. It reads public files only.
What to do
- Update to version 1.4.02, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch Appointment Booking Calendar to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to Chloe Chamberland, Wordfence PRISM.
The Appointment Booking Calendar plugin for WordPress is vulnerable to Sensitive Information Exposure in versions up to, and including, 1.4.01. This is due to insufficient authorization and missing per-calendar ownership checks in the cpabc_appointments_calendar_load2() function, which is reachable via the cpabc_calendar_load2=1 query parameter in wp-admin and only checks is_admin() && current_user_can('edit_posts'), a capability available to Contributor-level users and above. This makes it possible for authenticated attackers with Contributor-level access and above to supply an arbitrary calendar ID via the id parameter and extract customer booking information, including email addresses, names, phone numbers, booking times, and comments, from any calendar managed by the plugin.
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 Appointment Booking Calendar
All 17| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium6.4 | Authenticated (Subscriber+) Stored Cross-Site Scripting via 'vs_text_submitbtn' Parameter ≤1.4.05Update to 1.4.06 | CVE-2026-111727 | |
| Medium4.3 | Missing Authorization to Authenticated (Contributor+) Sensitive Information Disclosure ≤1.4.02Update to 1.4.03 | CVE-2026-12113 | |
| Medium5.3 | Missing Authorization to Arbitrary Booking Confirmation via 'cpabc_ipncheck' Parameter ≤1.3.96Update to 1.3.97 | CVE-2025-13317 | |
| Medium4.3 | Missing Authorization ≤1.3.95Update to 1.3.96 | CVE-2025-64261 | |
| Medium5.3 | Missing Authorization ≤1.3.92Update to 1.3.93 | CVE-2025-46247 |
- Medium6.4Authenticated (Subscriber+) Stored Cross-Site Scripting via 'vs_text_submitbtn' Parameter
≤1.4.05Update to 1.4.06
- Medium4.3Missing Authorization to Authenticated (Contributor+) Sensitive Information Disclosure
≤1.4.02Update to 1.4.03
- Medium5.3Missing Authorization to Arbitrary Booking Confirmation via 'cpabc_ipncheck' Parameter
≤1.3.96Update to 1.3.97
- Medium4.3Missing Authorization
≤1.3.95Update to 1.3.96
- Medium5.3Missing Authorization
≤1.3.92Update to 1.3.93
Same weakness (Information Exposure)
All Information Exposure| 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
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Timeline
CVE published
Severity medium, CVSS 4.3
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.