CVE-2026-103587 in QloApps
Summary
by MITRE • 10/01/2026
QloApps through 1.7.0 contains a reflected cross-site scripting vulnerability in the back-office Hotel Reservation System Book Now search, where date_to and id_room_type parameters are copied into template variables without validation. Attackers can craft a malicious link containing JavaScript payload in these parameters that executes in an authenticated administrator's session when the victim follows the link.
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Analysis
by VulDB Data Team • 10/01/2026
The vulnerability identified in QloApps versions through 1.7.0 represents a classic instance of reflected cross-site scripting, specifically targeting the administrative interface known as the back-office Hotel Reservation System. This flaw is located within the Book Now search functionality, where user-supplied input from URL parameters is processed without adequate sanitization or encoding before being rendered in the web page template. The specific vectors for this attack involve two distinct query string parameters: date_to and id_room_type. These parameters are directly copied into internal template variables by the application logic, bypassing any security filters that might otherwise neutralize malicious script content. This lack of input validation creates a direct pathway for attackers to inject executable JavaScript code into the context of an authenticated administrator's session.
From a technical perspective, the root cause lies in the improper handling of user-controllable data within the server-side rendering process. When an administrator accesses the reservation system and utilizes the search feature with crafted parameters, the application retrieves these values and inserts them directly into the HTML output without escaping special characters such as angle brackets or quotes. Consequently, when a victim clicks on a maliciously constructed link containing JavaScript payloads embedded in either the date_to or id_room_type fields, the browser interprets this content not merely as text but as executable code. This execution occurs within the security context of the logged-in administrator, granting the attacker the ability to run arbitrary scripts with the same privileges and permissions as that user account.
The operational impact of this vulnerability is significant due to its potential for privilege escalation and data compromise. Since the attack requires the victim to be an authenticated administrator, successful exploitation allows an attacker to hijack administrative sessions. This can lead to unauthorized access to sensitive hotel reservation data, including guest personal information, payment details, and booking histories. Furthermore, attackers could use this foothold to perform actions on behalf of the administrator, such as modifying system configurations, deleting records, or installing malicious plugins that persist beyond the initial session. The reflected nature of the XSS means that exploitation typically relies on social engineering tactics, where an attacker must trick a specific target into visiting a crafted URL, often through phishing emails or deceptive links shared via other communication channels.
In terms of industry classification standards, this vulnerability aligns with CWE-79, which describes Improper Neutralization of Input During Web Page Generation commonly known as Cross-site Scripting. Specifically, it falls under the sub-category of Reflected XSS where the malicious script is returned immediately by the web application in response to a user's request. From an offensive security framework perspective, this activity maps to MITRE ATT&CK technique T1059, Command and Scripting Interpreter, specifically within the context of browser-based execution via DOM or HTML injection. The attack vector leverages the trust that users place in links they click on, exploiting the session management mechanisms of the web application rather than breaking encryption or bypassing authentication protocols directly.
Mitigation strategies for this vulnerability must focus on rigorous input validation and output encoding practices within the QloApps codebase. Developers should implement strict allow-list filtering for the date_to parameter to ensure it only accepts valid date formats, thereby rejecting any non-date characters that could form part of a script payload. For the id_room_type parameter, integer-only validation or explicit mapping against known valid room type identifiers would prevent injection attempts. Additionally, implementing context-sensitive output encoding is critical; all user-supplied data rendered in HTML must be encoded to ensure special characters are treated as literal text rather than executable code. Deploying a Web Application Firewall can also provide an additional layer of defense by detecting and blocking common XSS patterns in HTTP requests before they reach the application logic. Regular security audits and penetration testing should be conducted to identify similar flaws across other modules that handle user input without proper sanitization protocols.