CVE-2026-108123 murgroland CVE debrief

Who should care

Administrators of WordPress installations with the WP Booking System – Booking Calendar plugin should assess exposure and take action to protect sensitive booking data. This includes verifying and updating to a patched version, restricting access to sensitive data, and monitoring for suspicious activity. Additionally, security teams and vulnerability management teams should review the issue and plan for necessary updates or mitigations.

Why it matters

The WP Booking System – Booking Calendar plugin vulnerability allows unauthenticated attackers to access sensitive booking information, exposing customer PII. Administrators should assess exposure and update to a patched version to prevent exploitation.

• Unauthenticated attackers can access sensitive booking information
• Customer PII is exposed, including names, email addresses, phone numbers, messages, and booking dates
• Administrators must verify and update to a patched version to prevent exploitation

Technical summary

The WP Booking System – Booking Calendar plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 2.1.0.3. 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 read the stored notification email body of any booking by iterating booking_id and email_log_id, exposing customer PII including names, email addresses, phone numbers, messages, and booking dates intended to be visible only to administrators.

Defensive priority

Administrators of WordPress installations with the WP Booking System – Booking Calendar plugin should verify and update to a patched version, restrict access to sensitive data, and monitor for suspicious activity.

Recommended defensive actions

• Update WP Booking System – Booking Calendar plugin to a patched version
• Restrict access to sensitive booking data
• Monitor for suspicious activity
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The vulnerability is due to improper authorization checks in the WP Booking System – Booking Calendar plugin, allowing access to sensitive booking information. Evidence from the CVE record and source references supports this finding. The plugin does not properly verify that a user is authorized to perform an action, making it possible for unauthenticated attackers to read the stored notification email body of any booking by iterating booking_id and email_log_id. This issue exposes customer PII intended to be visible only to The CVE-

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.