This vulnerability affects SourceCodester Indian Invoicing System 1.0 and involves improper access controls in the backend endpoints. Remote attackers can exploit this flaw without user interaction or elevated privileges to gain unauthorized access to functionality or data. Multiple endpoints are impacted, but the exact functions affected are unspecified. The CVSS 4.0 base score is 5.3 (medium), reflecting network attack vector, low complexity, no privileges required, no user interaction, and low to limited impact on confidentiality, integrity, and availability. The vulnerability was publicly disclosed on May 25, 2026, but no official patch or vendor advisory detailing remediation is available.

Successful exploitation can lead to unauthorized access to backend functionality or data within the Indian Invoicing System, potentially compromising confidentiality, integrity, and availability to a limited extent. The attack can be performed remotely without user interaction or elevated privileges, increasing the risk of exploitation. However, the impact is considered medium severity and no known active exploitation has been reported.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, organizations should consider restricting access to affected backend endpoints through network controls or other compensating measures. Monitor for updates from SourceCodester regarding patches or official mitigations.