CVE-2026-19806: Support Genix <= 1.4.52 - Authenticated (Subscriber+) Authentication Bypass to Administrator Account Takeover via 'p' Parameter Forged Guest Token

The Support Genix – Helpdesk, AI Chatbot, Knowledge Base & Customer Support Ticketing System plugin for WordPress is vulnerable to Authentication Bypass leading to Administrator Account Takeover in all versions up to, and including, 1.4.52 via the guestticketlogin() function and its p parameter. This is due to the site-wide AES-256-CBC encryption key being derived from only three two-digit wprand(10, 99) values and a Unix timestamp via md5() — yielding approximately 19.5 bits of entropy — combined with a deterministic IV derived from the password, no authentication tag on the ciphertext, and no capability check, nonce, or session validation on the publicly reachable /sgnix/?p=<token> endpoint. This makes it possible for authenticated attackers, with subscriber-level access and above, who can obtain a single legitimate guest ticket token as a known-plaintext oracle and bound the plugin activation timestamp, to exhaust the ~729,000-candidate keyspace entirely offline, recover the site-wide encryption key, and forge a self-consistent {ticketid, ticketuser} token targeting any administrator-owned ticket. Submitting the forged token to the unprotected endpoint causes wpsetauthcookie() to be called for that administrator, granting the attacker full administrative access to the WordPress site.