CVE-2026-1816 describes a vulnerability in the TEİAŞ Mobile Application where excessive authentication attempts are not properly restricted, enabling brute force attacks. Affected versions include 1.6.2 through versions before 1.13. The vulnerability is classified under CWE-307 (Improper Restriction of Excessive Authentication Attempts). The CVSS 3.1 score is 6.3 with vector AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N, indicating network attack vector, low attack complexity, requiring some privileges and user interaction, with high confidentiality impact but low integrity and no availability impact. No patch or official remediation level has been published, and no exploits are known in the wild.

Successful exploitation could allow an attacker with some privileges and user interaction to perform brute force attacks on the authentication mechanism, potentially leading to unauthorized access and high confidentiality impact. Integrity impact is low and availability is not affected. The vulnerability affects confidentiality of user or system data within the mobile application.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, organizations should monitor for updates from Turkiye Electricity Transmission Corporation (TEİAŞ) and consider implementing compensating controls such as rate limiting or account lockout mechanisms if possible. No vendor advisory or official patch has been published at this time.