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Team Fortress Exploits
Note: by the time you read this, some of these may be fixed by patches. Be sure to check the patch pages
Medic Permanent Invulnerability Exploit
The medic permanent invulnerability exploit is achieved by a medic that crashes the game while using invulnerability. To achieve this the medic first reach 100% of on the uber charge and then crash, disconnect, or plug pull after activating the uber charge on another player to give them permanent invulnerability.
Soldier Rocket Exploit
A new exploit for the soldier has been found in Team Fortress 2. Soldiers can shoot through the floor with rockets The splash damage from the rocket allows the soldier to kill people that they cannot see.
The reason for this exploit working is because rockets have a hit box that is much bigger than their model. You can test this out by trying to pass in front of another players rocket and passing behind another players rocket. Both will result in damage which should be impossible unless the hitbox is bigger than the model.
Maps like ctf_2fort and tc_hydro are especially prone to the through the floor type of attack as they contain multiple levels. My favorite place to use this is griefing people underneath the respawn on 2fort.
Spy Disguise Exploit
A new spy exploit has been found in Team Fortress 2. A spy can attack with his butterfly knife or revolver and maintain his disguise if he changes his disguise and then makes his attack before the change completes. The spy can only maintain disguise if he waits at until about 1 second before the disguise change finishes.
The easiest way is to wait until the sound finishes playing before you attack. This exploit is all about perfect timing and is very hard to pull off.