In Terminalfour 8 through 8.4.1.1, the userLevel parameter in the user management function is not subject to proper server-side authorization checks. A Power User can intercept and modify this parameter to assign the Administrator role to other existing lower-privileged accounts, or invite a new lower-privileged account and escalate its privileges. While manipulating this request, the Power User can also change the target account's password, effectively taking full control of it.

A Server-Side Request Forgery (SSRF) vulnerability in Terminalfour before 8.3.19 allows authenticated users to use specific features to access internal services including sensitive information on the server that Terminalfour runs on.

An issue was discovered in Terminalfour 7.4 through 7.4.0004 QP3 and 8 through 8.3.19, and Formbank through 2.1.10-FINAL. Unauthenticated Stored Cross-Site Scripting can occur, with resultant Admin Session Hijacking. The attack vectors are Form Builder and Form Preview.

In Terminalfour before 8.3.16, misconfigured LDAP users are able to login with an invalid password.

The Logback component in Terminalfour before 8.3.14.1 allows OS administrators to obtain sensitive information from application server logs when debug logging is enabled. The fixed versions are 8.2.18.7, 8.2.18.2.2, 8.3.11.1, and 8.3.14.1.

Terminalfour versions 8.3.7, 8.3.x versions prior to version 8.3.8 and r 8.2.x versions prior to version 8.2.18.5 or 8.2.18.2.1 are vulnerable to (XSS) vulnerability that could be exploited by an attacker to mislead an administrator and steal their credentials.