CVE-2024-8432 in Appointment & Event Booking Calendar Plugin
Summary
by MITRE • 09/24/2024
The Appointment & Event Booking Calendar Plugin – Webba Booking plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the save_appearance() function in all versions up to, and including, 5.0.48. This makes it possible for authenticated attackers, with Subscriber-level access and above, to modify the booking form's CSS.
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Analysis
by VulDB Data Team • 09/24/2024
The CVE-2024-8432 vulnerability affects the Webba Booking plugin for WordPress, specifically targeting the Appointment & Event Booking Calendar functionality. This security flaw represents a critical authorization bypass issue that undermines the integrity of the plugin's administrative controls. The vulnerability stems from a fundamental missing capability check within the save_appearance() function, which is responsible for handling CSS modifications to booking forms. Attackers exploiting this weakness can manipulate the visual presentation of booking interfaces without proper authorization, potentially leading to more severe consequences through social engineering or data manipulation attacks.
The technical implementation of this vulnerability resides in the plugin's permission handling mechanism where the save_appearance() function fails to verify whether the requesting user possesses sufficient privileges to modify appearance settings. This missing capability check creates a direct path for authenticated users with Subscriber-level access or higher to execute unauthorized modifications to the booking form's CSS styling parameters. The vulnerability affects all versions up to and including 5.0.48, indicating a prolonged period during which this security gap existed without proper access controls. From a cybersecurity perspective, this represents a classic privilege escalation vector that allows lower-privileged users to gain elevated control over plugin configuration elements.
The operational impact of this vulnerability extends beyond simple visual modifications, as attackers could potentially use CSS changes to obscure important booking information, redirect users to malicious sites, or create confusion during the booking process. The unauthorized modification capability could enable threat actors to conduct social engineering campaigns by altering form elements to collect additional sensitive information or manipulate user expectations. This vulnerability particularly concerns administrators managing multi-user WordPress environments where subscribers might have access to booking systems for legitimate purposes but should not be able to modify core interface elements. The implications are significant for organizations relying on webba booking for appointment management, as compromised form appearance could disrupt business operations and potentially expose sensitive data.
Mitigation strategies should prioritize immediate patching of the Webba Booking plugin to the latest version that addresses this capability check deficiency. System administrators should also implement additional monitoring of plugin configuration changes and establish more granular user permission controls within WordPress. The vulnerability aligns with CWE-284, which addresses improper access control, and maps to ATT&CK technique T1078 for valid accounts and privilege escalation. Organizations should conduct comprehensive security audits of all WordPress plugins to identify similar missing capability checks, particularly in functions handling user interface modifications or configuration changes. Regular security scanning and vulnerability assessment procedures should include checks for unauthorized modification capabilities in third-party WordPress plugins to prevent similar issues from persisting in the environment.