chuhpl Book a Room Event Calendar Plugin up to 1.9 on WordPress Setting settings_form action cross-site request forgery

Summaryinfo

A vulnerability categorized as problematic has been discovered in chuhpl Book a Room Event Calendar Plugin up to 1.9 on WordPress. This impacts the function settings_form of the component Setting Handler. The manipulation of the argument action results in cross-site request forgery. This vulnerability is identified as CVE-2026-9721. The attack can be executed remotely. There is not any exploit available. It is best practice to apply a patch to resolve this issue.

Detailsinfo

A vulnerability, which was classified as problematic, was found in chuhpl Book a Room Event Calendar Plugin up to 1.9 on WordPress. Affected is the function settings_form of the component Setting Handler. The manipulation of the argument action with an unknown input leads to a cross-site request forgery vulnerability. CWE is classifying the issue as CWE-352. The web application does not, or can not, sufficiently verify whether a well-formed, valid, consistent request was intentionally provided by the user who submitted the request. This is going to have an impact on integrity. CVE summarizes:

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.

The weakness was released by swat. The advisory is available at wordfence.com. This vulnerability is traded as CVE-2026-9721 since 05/27/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit.

Applying a patch is able to eliminate this problem.

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Productinfo

Type

• Calendar Software

Vendor

• chuhpl

Name

• Book a Room Event Calendar Plugin

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9

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CPE 2.2info

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