CVE-2026-26745 identifies a second order SQL Injection vulnerability in OpenSourcePOS version 3.4.1, specifically in the handling of the currency_symbol configuration field. Unlike direct SQL injection where malicious input is executed immediately, this vulnerability involves storing the input first and executing it later in a dynamically constructed SQL query. The root cause is the lack of proper sanitization or use of parameterized queries when the stored currency_symbol value is concatenated into SQL statements. An attacker who can modify the currency_symbol configuration—likely requiring some level of authenticated access—can inject arbitrary SQL expressions that execute when the vulnerable query runs. This can lead to unauthorized data retrieval, modification, or deletion within the POS system's database. The vulnerability is significant because POS systems handle sensitive financial and transactional data. No patches or fixes are currently linked, and no known exploits have been reported in the wild. The absence of a CVSS score necessitates an independent severity assessment. The vulnerability highlights the risks of improper input handling in configuration fields that are later used in SQL queries, emphasizing the need for secure coding practices such as input validation and prepared statements.

The potential impact of CVE-2026-26745 is substantial for organizations using OpenSourcePOS 3.4.1. Successful exploitation could allow attackers to execute arbitrary SQL commands, leading to unauthorized disclosure of sensitive customer and transaction data, data tampering, or even deletion of critical records. This compromises data confidentiality, integrity, and potentially availability of the POS system. Given that POS systems are integral to retail and financial operations, such an attack could disrupt business operations, cause financial losses, and damage customer trust. Additionally, attackers could leverage this vulnerability as a foothold for further network intrusion or pivoting to other systems. The requirement for attacker access to modify configuration settings somewhat limits the attack surface but does not eliminate risk, especially in environments with weak access controls or insider threats. The lack of known exploits suggests the vulnerability is not yet widely weaponized, but the risk remains high due to the nature of the flaw and the criticality of affected systems.

To mitigate CVE-2026-26745, organizations should first verify if they are using OpenSourcePOS version 3.4.1 and restrict access to configuration settings, especially the currency_symbol field, to trusted administrators only. Implement strict access controls and audit logs to detect unauthorized changes. Until an official patch is released, apply input validation to ensure that only valid currency symbols are accepted, rejecting any input containing SQL control characters or suspicious patterns. Modify the application code to use parameterized queries or prepared statements when constructing SQL commands involving configuration values, eliminating direct concatenation of user-controlled input. Regularly review and sanitize all configuration inputs that may be used in SQL queries. Conduct security testing, including code review and penetration testing, focusing on configuration management interfaces. Maintain up-to-date backups of POS data to enable recovery in case of compromise. Monitor for unusual database activity that could indicate exploitation attempts. Engage with the OpenSourcePOS community or vendor for updates and patches addressing this vulnerability.