A CWE-1390 Weak Authentication in the PIN authentication mechanism in Q-Free MaxTime less than or equal to version 2.11.0 allows an unauthenticated remote attacker to brute-force user PINs via multiple crafted HTTP requests.
The product uses an authentication mechanism to restrict access to specific users or identities, but the mechanism does not sufficiently prove that the claimed identity is correct.
Attackers may be able to bypass weak authentication faster and/or with less effort than expected.