CVE-2026-103690 in Leave Management System
Summary
by MITRE • 10/01/2026
A flaw has been found in itsourcecode Leave Management System 1.0. This vulnerability affects unknown code of the file /module/leave/controller.php. Executing a manipulation of the argument LEAVEID can lead to sql injection. The attack may be performed from remote. The exploit has been published and may be used.
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Analysis
by VulDB Data Team • 10/01/2026
The itsourcecode Leave Management System version 1.0 contains a critical security vulnerability located within the file /module/leave/controller.php, specifically involving improper handling of user-supplied input for the LEAVEID argument. This flaw represents a classic instance of SQL injection, where an application fails to properly sanitize or parameterize data before incorporating it into database queries. The root cause lies in the lack of robust validation mechanisms on the server side, allowing malicious actors to inject arbitrary Structured Query Language commands directly into the backend database engine through manipulated HTTP requests targeting this specific controller endpoint.
From a technical perspective, the vulnerability stems from the direct concatenation or insufficient escaping of the LEAVEID parameter within SQL statements executed by the application logic. When an attacker provides specially crafted input for the leave identifier, they can alter the structure of the intended query. This manipulation enables the execution of unintended database operations beyond the scope of normal system functionality. Since the vulnerability is present in a controller file that likely handles active user sessions and administrative functions related to employee leave records, the potential impact extends far beyond simple data disclosure.
The operational impact of this SQL injection flaw is severe due to its remote exploitability. Attackers can leverage automated tools or manual exploitation techniques from any network location without requiring prior authentication in some configurations, although authenticated access may amplify the damage if user privileges are involved. Successful exploitation allows for unauthorized access to sensitive organizational data, including personal employee information, leave balances, and approval histories stored within the database. Furthermore, advanced SQL injection attacks can lead to full system compromise by extracting credentials from other tables, modifying application logic through stacked queries, or even executing operating system commands if the underlying database engine permits such extensions like xp_cmdshell in Microsoft SQL Server environments.
This vulnerability aligns with Common Weakness Enumeration identifier CWE-89, which classifies improper neutralization of special elements used in an SQL command, commonly known as SQL Injection. In terms of offensive security frameworks, this flaw facilitates techniques categorized under MITRE ATT&CK ID T1059, specifically Command and Scripting Interpreter interactions via database interfaces, or more broadly under data exfiltration tactics such as T1005 Data from Local System. The existence of a published exploit significantly lowers the barrier to entry for attackers, increasing the likelihood of automated scanning and exploitation attempts against publicly accessible instances of this software.
Mitigation strategies must prioritize immediate remediation through code-level fixes. Developers should replace direct string concatenation with prepared statements or parameterized queries using secure database interaction libraries supported by the application framework. This ensures that user input is treated strictly as data rather than executable code, effectively neutralizing injection attempts regardless of content. Additionally implementing strict input validation on both client and server sides can provide defense in depth, although it should not be relied upon as the sole security control. For organizations currently running this version, applying vendor-provided patches if available or migrating to a more secure alternative is strongly recommended until the codebase is refactored to address these fundamental architectural weaknesses.