CVE-2026-109525 in Online-Appointment-Booking-System
Summary
by MITRE • 10/13/2026
A vulnerability was identified in girishsaraf Online-Appointment-Booking-System up to f427b4757128ca253d33d0cc4e87bbb9c999a4d5. This affects an unknown part of the file changebookingstatus.php of the component submit2 Handler. Such manipulation of the argument username[]/timestamp[]/status[] leads to missing authorization. The attack may be performed from remote. The exploit is publicly available and might be used. This product utilizes a rolling release system for continuous delivery, and as such, version information for affected or updated releases is not disclosed. The project was informed of the problem early through an issue report but has not responded yet.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 10/13/2026
The vulnerability identified in girishsaraf Online-Appointment-Booking-System represents a critical failure in access control mechanisms within the application's backend logic. Specifically, the flaw resides in the changebookingstatus.php file, which is invoked by the submit2 Handler component. This module is responsible for processing updates to appointment statuses, such as confirming or canceling bookings. The core technical deficiency lies in how the system validates user permissions before executing state changes on behalf of a requested account. Instead of verifying that the authenticated session corresponds to the entity whose status is being modified, the application relies solely on client-supplied input parameters for username[], timestamp[], and status[]. This architectural oversight allows an attacker to manipulate these arguments directly, effectively bypassing any intended authorization checks. By altering the username parameter in a POST request, an adversary can impersonate other users or administrative accounts without possessing valid credentials for those targets.
This type of flaw is classically categorized under CWE-285: Improper Authorization, where software does not properly verify that the user has sufficient privileges to perform the requested action. In practical terms, this means that any authenticated user with access to the booking interface can escalate their capabilities or disrupt operations for other users. For instance, a regular customer could change the status of another customer's appointment from confirmed to canceled, causing significant operational disruption and loss of trust in the platform. Furthermore, if administrative endpoints are accessible through similar patterns, an attacker might gain unauthorized control over system configurations or user data. The absence of server-side validation against session tokens or database ownership checks renders the authorization layer entirely ineffective for these specific handlers.
The impact of this vulnerability is severe due to its remote exploitability and the public availability of proof-of-concept code. Because the attack vector requires only network connectivity to the web application, it falls under ATT&CK technique T1078: Valid Accounts, specifically involving legitimate but misused credentials or impersonation via parameter manipulation. The fact that an exploit is publicly available significantly lowers the barrier for entry, allowing less sophisticated threat actors to conduct automated attacks against vulnerable instances. Since the product utilizes a rolling release model with continuous delivery, version pinning is not feasible in traditional ways. This means administrators cannot simply patch to a specific fixed version number; instead, they must monitor upstream repositories or commit hashes for fixes. The lack of response from the project maintainers despite early notification exacerbates the risk, leaving deployed instances exposed indefinitely unless users implement their own mitigations or migrate to alternative solutions.
Mitigation strategies should focus on immediate defensive measures since a vendor patch is not currently available. Administrators should enforce strict input validation and ensure that all state-changing operations verify the current session's identity against the target resource owner in the database. Implementing server-side checks that compare the authenticated user ID with the username parameter provided in the request would neutralize this specific attack vector. Additionally, deploying a Web Application Firewall (WAF) with rules designed to detect anomalous patterns in POST requests targeting booking status endpoints can provide an external layer of defense. For organizations unable to modify the source code immediately, restricting network access to the application via IP whitelisting or requiring multi-factor authentication for all administrative functions may reduce the likelihood of successful exploitation until a permanent fix is integrated into the rolling release stream.