This vulnerability in opensourcepos Open Source Point of Sale up to version 3.4.2 allows an attacker to bypass or improperly restrict excessive authentication attempts via the Login::index function in app/Config/Filters.php. The flaw permits remote attackers to attempt multiple authentications without effective throttling or lockout mechanisms. The exploitability is considered difficult due to the high complexity required. The issue was reported early to the project but remains unaddressed, and public exploit code exists.

An attacker can perform numerous authentication attempts remotely without proper restriction, potentially enabling brute force or credential stuffing attacks. However, the attack complexity is high, and no privilege escalation or direct data compromise is indicated. The vulnerability could lead to unauthorized access if credentials are guessed or obtained through repeated attempts.

No official fix or patch is currently available, and the vendor has not responded to the issue report. Users should monitor vendor advisories for updates. In the meantime, implementing external rate limiting or additional authentication controls may help mitigate the risk. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance.