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TI-2026-70149 Aliases CVE-2026-18496GHSA-865w-3pc6-gq4c

Sensitive data exposure in Booking Calendar for WordPress

Priority LOW 23CWE-200Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
Low · None · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-200.

Summary

The Booking Calendar plugin for WordPress is affected in all versions up to and including 11.4.3. The flaw exposes sensitive information to unauthorized actors through the wpbc_is_show_popover_in_flex_timeline() function (CWE-200). An unauthenticated remote attacker can extract names, email addresses and phone numbers of customers who have made bookings.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

The Booking Calendar plugin for WordPress is vulnerable to Sensitive Information Exposure in all versions up to, and including, 11.4.3 via the wpbc_is_show_popover_in_flex_timeline() function. This makes it possible for unauthenticated attackers to extract sensitive data including names, email addresses, and phone numbers of customers who have made bookings.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00214 11th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
wpdevelopBooking Calendarup to 11.4.3—No fix listedCNA
  • Booking Calendar Vendorwpdevelop Affected up to 11.4.3 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for Booking Calendar.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Timeline

  1. 2026-10-10 Threatist record created from CVE-2026-18496
  2. 2026-10-10 Alias added: GHSA-865w-3pc6-gq4c
  3. 2026-10-11 CISA SSVC decision points changed

References

Other 2

  • TI-2025-13137 Booking Calendar <= 10.14.8 - Unauthenticated SQL Injection via dates_to_check CVSS 3.1HIGH 7.5
  • TI-2026-62468 Booking Calendar <= 11.8.2 - Authenticated (Editor+) Privilege Escalation to 'data_name' Parameter CVSS 3.1HIGH 7.2
  • TI-2026-24886 WordPress Booking Calendar plugin <= 10.14.15 - SQL Injection vulnerability CVSS 3.1HIGH 7.6
  • TI-2026-42521 WordPress Booking Calendar plugin <= 11.4.2 - Cross Site Scripting (XSS) vulnerability CVSS 3.1HIGH 7.1
  • TI-2026-51992 WordPress Booking Calendar plugin <= 11.7 - Broken Access Control vulnerability CVSS 3.1MEDIUM 5.3
  • TI-2026-01129 Booking Calendar <= 10.14.13 - Missing Authorization to Unauthenticated Booking Details Exposure CVSS 3.1MEDIUM 5.3
See all 19 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences