CVE-2026-16025: CWE-1284 Improper validation of specified quantity in input in PayTR Payment and Electronic Money Institution Inc. PayTR Virtual Pos iFrame API WHMCS Module

The vulnerability identified as CVE-2026-16025 in the PayTR Virtual Pos iFrame API WHMCS Module involves improper validation of the specified quantity in input data. This weakness allows an attacker to manipulate input data, which can result in denial of service conditions. The affected versions are from 9.0.0 before 9.0.3. The CVSS v3.1 base score is 7.5, indicating a high severity with network attack vector, low attack complexity, no privileges required, no user interaction, unchanged scope, no confidentiality or integrity impact, but high impact on availability.

The vulnerability can be exploited remotely without authentication or user interaction to cause denial of service, impacting the availability of the PayTR Virtual Pos iFrame API WHMCS Module. There is no impact on confidentiality or integrity according to the CVSS vector.

No explicit patch or remediation details are provided in the input data. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, users should monitor vendor communications for updates and consider mitigating exposure by restricting access or input validation controls if feasible.