One of the simplest ways to hack a Telegram account is to gain physical access to an unlocked phone or device.
In this case, all of Telegram's security measures go out the window.
On the other hand, Telegram bots, group administrators, and even user accounts can be compromised through phishing, malware, fraud, or other methods.
Like any other application, the Telegram messaging app is not 100% secure from hackers.
Furthermore, a new scheme for hacking accounts has emerged in Telegram. In Telegram, it's now possible to purchase a Premium subscription—something that malicious actors have started to exploit to steal others' accounts.
To steal an account, scammers in Telegram send users messages offering a "gift subscription" to Premium for a year.
The link's name appears official, but it contains a "hidden" URL that directs to a phishing site designed to mimic the web version of Telegram.
The victim enters their account's username and password, potentially losing access to both the account and the contents of the linked wallet.
To check a link in Telegram without clicking on it, simply hold your finger on the link until a context menu appears, revealing the actual address.
To verify a link on a PC, hover the cursor over the link and wait a couple of seconds.
Source: itechua.