CVE-2026-9721
Deferred Deferred - Pending Action

Cross-Site Request Forgery in Book a Room Event Calendar WordPress Plugin

Publication date: 2026-06-24

Last updated on: 2026-06-24

Assigner: Wordfence

Description
The Book a Room Event Calendar plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 1.9. This is due to missing or incorrect nonce validation on the settings_form()/update_settings() functionality. The plugin's options page handler dispatches on the 'action' POST parameter and calls update_settings(), which persists plugin configuration (including the external database host, username, password, prefix, database name, encryption key, and registration page URL) via update_option(), without ever generating a nonce field in the settings form or verifying one (no wp_nonce_field(), check_admin_referer(), or wp_verify_nonce() exists anywhere in the plugin). This makes it possible for unauthenticated attackers to modify the plugin's database connection settings via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

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Meta Information

Published
2026-06-24
Last Modified
2026-06-24
Generated
2026-07-14
AI Q&A
2026-06-24
EPSS Evaluated
2026-07-13
NVD
CVE-2026-9721
EUVD
EUVD-2026-38658

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
book_a_room_event_calendar plugin to 1.9 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-352 The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.

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Executive Summary

The Book a Room Event Calendar plugin for WordPress has a Cross-Site Request Forgery (CSRF) vulnerability in all versions up to and including 1.9. This happens because the plugin does not use nonce validation on its settings form and update functions. Specifically, the plugin's options page uses the 'action' POST parameter to call update_settings(), which saves sensitive plugin configuration such as database connection details without verifying that the request is legitimate. Since there is no nonce field generated or checked, an attacker can trick a site administrator into clicking a malicious link that changes these settings without authorization.

Mitigation Strategies

To mitigate this vulnerability, you should update the Book a Room Event Calendar plugin to a version later than 1.9 where nonce validation is properly implemented.

If an update is not immediately available, restrict access to the plugin's settings page to trusted administrators only and avoid clicking on untrusted links that could trigger forged requests.

Additionally, monitor and audit changes to the plugin's database connection settings to detect unauthorized modifications.

Impact Analysis

This vulnerability allows an unauthenticated attacker to modify the plugin's database connection settings by tricking an administrator into performing an action like clicking a link. This could lead to unauthorized changes in the plugin's configuration, potentially compromising the integrity and security of the website's data and operations.

Compliance Impact

The vulnerability allows unauthenticated attackers to modify the plugin's database connection settings via a forged request, potentially leading to unauthorized changes in configuration.

However, there is no direct information provided about how this vulnerability impacts compliance with common standards and regulations such as GDPR or HIPAA.

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