The alert stated that the student was walking near Daniels Hall around 11 p.m. when a man approached her, tried to talk to her and put his arm around her.
The student then sprayed him with pepper spray, ran away and called police.
The incident follows two other alerts sent out just days ago.
The first one was sent out last Thursday after another female student reported an attack.
The student said she was sexually assaulted around 4 a.m. while walking near the Free Expression Tunnel.
The suspect was described as a young black man. Tuesday night's attacker was also described as a young black man, but reportedly had a full beard.
Another alert was sent out over the weekend, when a student was robbed at knifepoint near campus.
The student told police he was approached by a man asking for money Saturday night just after 9:30 p.m. The student said when he told the man he didn't have any money, the man pulled out a knife.
The student gave the robber cash and he said the suspect ran toward Hillsborough Street.
The suspect was described as a black man in his 40s about 6 feet tall with a slim build. He has gray facial hair and was wearing a red jacket and blue cargo pants.
Police are reminding students to walk in well lit areas and in groups.