Answer in brief
CVE-2026-109369 records a Medium severity (CVSS 6.8) vulnerability in WP Booking System <= 2.1.0.3 - Missing Authorization to Authenticated (Subscriber+) Privilege Escalation via 'user_permission' Parameter via Cross-Form Nonce Reuse. The current sources do not mark it as known exploited. The current feed maps murgroland/WP Booking System – Booking Calendar (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 6.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps murgroland/WP Booking System – Booking Calendar (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| murgroland/WP Booking System – Booking Calendargeneric | >=0 <=2.1.0.3 | Not reported |
Published upstream
Oct 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 17, 2026
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 authenticated attackers, with subscriber-level access and above, to grant themselves and arbitrary other users edit access to every booking form on the site by overwriting the user_permission meta that governs the plugin's own access-control list. Exploitation requires the attacker to have already been delegated edit rights on at least one booking form, as this delegation both downgrades the submenu capability to 'read' (making the edit page accessible) and allows them to harvest a valid wpbs_edit_form nonce that will pass validation against any other form_id.
Quoted source text, attributed separately from HOL analysis.