CVE-2023-24599 in OX App Suite
Summary
by MITRE • 05/29/2023
OX App Suite before backend 7.10.6-rev37 allows authenticated users to change the appointments of arbitrary users via conflicting ID numbers, aka "ID confusion."
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Analysis
by VulDB Data Team • 10/23/2025
The vulnerability CVE-2023-24599 represents a critical authorization flaw in OX App Suite versions prior to backend 7.10.6-rev37 that enables authenticated users to manipulate calendar appointments belonging to other users through a technique known as ID confusion. This issue stems from inadequate input validation and improper access control mechanisms within the calendar management system, allowing malicious actors to exploit the system's reliance on numeric identifiers for appointment tracking and modification. The flaw specifically targets the appointment scheduling component where the application fails to properly verify ownership or authorization when processing appointment updates based on identifier values.
The technical implementation of this vulnerability exploits a fundamental weakness in the application's object reference handling where appointment identifiers are not properly validated against the authenticated user's permissions. When a user submits an appointment update request, the system accepts the provided identifier without performing a comprehensive check to ensure that the identifier belongs to the requesting user's calendar. This creates a scenario where an authenticated attacker can craft requests using legitimate appointment IDs from other users' calendars, effectively allowing them to modify, delete, or manipulate appointments that they should not have access to. The vulnerability operates at the application layer and requires only authenticated access to the system, making it particularly dangerous as it can be exploited by insiders or compromised accounts.
The operational impact of this vulnerability extends beyond simple data manipulation to encompass potential privacy violations, calendar disruption, and unauthorized access to sensitive scheduling information. Attackers could potentially schedule malicious meetings, delete important appointments, or modify existing bookings to disrupt business operations. This type of vulnerability aligns with CWE-284 which describes improper access control, and represents a clear violation of the principle of least privilege in security design. The attack vector requires minimal technical expertise and can be automated, making it particularly attractive to threat actors who seek to exploit organizational calendar systems for espionage or operational disruption.
Organizations using affected versions of OX App Suite should immediately implement the vendor-provided patch to address the ID confusion vulnerability and ensure that all users are updated to backend version 7.10.6-rev37 or later. Additional mitigations include implementing enhanced monitoring of calendar modification activities, establishing stricter access controls for calendar management functions, and conducting thorough security reviews of the application's authentication and authorization mechanisms. The vulnerability demonstrates the importance of proper input validation and access control implementation as outlined in the mitre attack framework where such flaws can lead to privilege escalation and unauthorized data access. Security teams should also consider implementing network segmentation and logging controls to detect anomalous calendar modification patterns that could indicate exploitation attempts.