UK telecommunications firm TalkTalk is investigating a third-party provider information breach after a menace actor started promoting alleged buyer information on a hacking discussion board.
“As a part of our common safety monitoring, given our ongoing concentrate on defending clients’ private information, we had been made conscious of sudden entry to, and misuse of, certainly one of our third-party provider’s methods, nonetheless, no billing or monetary info was saved on this method,” TalkTalk informed BleepingComputer.
“Our Safety Incident Response group are persevering with to work with the provider relating to this matter and protecting containment steps had been taken instantly.”
“Our investigations are ongoing, nonetheless we will verify that the variety of potential clients referred to in sure on-line posts is wholly inaccurate and really considerably overstated.”
This assertion comes after somebody named “b0nd” started promoting what they declare is TalkTalk buyer information on a hacking discussion board that was allegedly stolen in a January 2025 information breach.
“Because the title says right now we are going to checklist on the market a big information breach involving TalkTalk. This breach passed off January 2025 and impacts 18,839,551 present and former clients.” reads the submit to a hacking discussion board.
Supply: BleepingComputer
The menace actor additionally shared a pattern of the info, which incorporates the subscriber’s title, electronic mail, last-used IP deal with, enterprise cellphone quantity, and residential cellphone quantity.
Whereas the discussion board submit says the stolen information comprises details about virtually 18.9 million present and former TalkTalk clients, the corporate doesn’t have almost that variety of subscribers, placing the authenticity of the breach unsure.
Moreover, the screenshots shared by the menace actor point out that the info was probably stolen from the Ascendon SaaS platform relatively than instantly from TalkTalk.
CSG Ascendon is a subscription administration platform that TalkTalk has traditionally used as a part of its operations.
In 2015, TalkTalk suffered an information breach the place hackers accessed the private particulars of over 150,000 clients. The incident led to a £400,000 high quality by the UK Data Commissioner’s Workplace.
BleepingComputer contacted the CSG to substantiate in the event that they suffered a breach however has not acquired a reply.
