Theklis

Theklis is a security researcher credited with 4 disclosed vulnerabilities in the WordSec WordPress vulnerability database, ranked #966 of 3,878 contributors. The disclosure was published in 2026.

Their research concentrates on Authorization Bypass Through User-Controlled Key, which accounts for 2 of their findings (50%). Other recurring categories include Code Injection, Cross-Site Scripting. The average CVSS score across these disclosures is 6.8, peaking at 9.1. Severity breakdown: 1 critical and 0 high.

The most affected software includes Forminator Forms (1), Listdom (1), Online Scheduling and Appointment… (1), across 4 distinct plugins, themes and core versions in total.

All 4 disclosed issues have since received a vendor fix. The most severe finding, "Online Scheduling and Appointment Booking System <= 28.2 - Insecure Direct Object Reference to Unauthenticated Arbitrary Booking Token Disclosure and Deletion via 'order_id' Parameter", scores 9.1 out of 10.