(CNBC) Equifax shares dropped as much as 3.5 percent Thursday after it said it has disabled one of its customer help online pages and is investigating another possible cyberbreach.

The consumer credit reporting company said its security teams are looking into another possible breach barely one month after it disclosed a hack that left exposed the personal information of 145.5 million people.

Shares of Equifax were down about 1.7 percent at around 1:55 p.m. ET.

Note: Read our discussion guidelines before commenting.