The data of 30,000 current and former Telstra staff have been exposed on the same forum the Optus breach data was posted on last week.
Data included the first names, last names and email addresses of Telstra employees who worked for the telco dating back to 2017, with 12,800 of those still employed by the company.
The data breach was related to a third party program that had previously provided Telstra’s Worklife NAB rewards program for staff, Telstra told staff on Saturday.
Also read: 4 Optus scams to watch out for
“We understand this may cause some anxiety to our people, particularly in the current climate of heightened awareness around cyber security,” Telstra’s group executive for transformation, communications and people, Alex Badenoch, said according to The Guardian.
“If you wish to find out more about the breach, or to find out if your email address was exposed, please contact our cyber team.
“In the meantime, we remind you as always to remain vigilant about any unexpected communications.”
The company’s current rewards program had not been compromised, Badenoch said, but the passwords of all users had been reset out of caution.
Optus data hack fallout
It comes as Optus confirms that more than 2.1 million customers had their personal information exposed by hackers.
In a video posted to the Optus website, chief executive Kelly Bayer Rosmarin, said approximately 1.2 million customers had at least one number from a personal identification document, and personal information, exposed.
In addition, about 900,000 customers have had numbers relating to expired IDs compromised, as well as personal information.