What are the security concerns with Telegram bots? How are the data access permissions managed for bots that operate via the API? For example, how much user data can a bot access, and in what situations would it be better not to grant permission? I'm curious because as I get more involved with automation, these issues keep popping into my head.
How safe are Telegram bots?
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Security for Telegram bots can actually be divided into two main layers: the bot itself and Telegram's API infrastructure. Bots use an access key called a *Bot API Token* to perform actions on behalf of users via the API. Thanks to this token, the bot can access messages in groups registered to your account, user information, and more. But the critical point here is *how and under what conditions* the bot gains this access. For example, when a user activates a bot on their account themselves, the bot can only execute commands—however, the *bot owner* (i.e., the person who has the token) can pull user data if needed. So, the real risk isn't the security of the token or the bot itself, but rather *how the application is configured*.
When it comes to permission management, Telegram bots have quite limited default permissions. For instance, when you add a bot to a group, it can only operate in "respond to the user who added the bot" mode—meaning it can reply to commands from group members but *cannot access private messages from other members*. However, the biggest slippery slope here is that some third-party bots *demand unnecessarily high permissions*. Many of the "free auto bots" I've encountered lately actually want admin access to all of the user's groups. In such cases, the only option is to refuse to grant permissions—because once you make the bot an admin, it's just a matter of time before it exploits your account.
I think the most important rule is: *research what kind of data a bot processes and how before using it*. For example, check the bot’s documentation—if it has any. While Telegram’s official Bot API is quite reliable, don’t forget that third-party bots often aren’t transparent about how (or if) they store data. If you're dealing with sensitive data (e.g., a company bot), you should keep the bot token secret and, if possible, set up a structure in the groups where the bot operates that grants *only the necessary command permissions*. Finally, testing the bot in a sandbox environment and restricting its permissions is also a good precaution.
That thing about bots accessing personal data has always bugged me a bit, especially when you think they can mess with even private messages, right? Or is that "they only see what I authorize" thing just a marketing brochure?
As someone who sees how user data just sits there while bots get broad access privileges, like a group of bots reading and analyzing messages in channels, it always feels a bit off, doesn’t it?