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Hackers are exploiting stolen email/password combinations to gain unauthorized access to Mastodon accounts.

CybersecurityPassword SecuritySep 7, 2026score 3.352 posts · 2304 replies across 2 instances
The thread discusses a security vulnerability in Mastodon where hackers are using credential stuffing to steal accounts. Users are advised to change their passwords and use strong, unique passwords. The issue highlights the risks of reusing passwords across multiple platforms.

Claims

Hackers are exploiting stolen email/password combinations to gain unauthorized access to Mastodon accounts.
Parent: CybersecurityEntity: MastodonImpact: negativeDate: Sep 7, 2026 - Sep 8, 2026Target: The security of Mastodon accounts
Users should change their passwords if they have used the same password for Mastodon and other platforms.
Parent: Password SecurityEntity: UsersImpact: negativeDate: Sep 7, 2026 - Sep 8, 2026Target: The practice of reusing passwords across multiple accounts

Source posts

@[email protected]
IMPORTANT MASTODON PASSWORD SECURITY/PRIVACY ISSUE… ---- For everyone: If you are using the same password for Mastodon that you use anywhere else, CHANGE YOUR PASSWORD NOW. A hacker is stealing accounts using something called “credential stuffing.” This means they use email/password combinations stolen from other sites. You can check if your email is in a data breach elsewhere: https://haveibeenpwned.com Create a new strong password: 1. 12+ characters 2. Capital/lowercase letters 3. At least one special character For admins: The hacker is using the same unique user agent. Go-http-client/1.1 We’re seeing a pattern of IPs, but they’re from varying ISPs. They’re also not changing the account emails. #Mastodon #Password #InfoSec #OpSec #Security #Privacy #Hacked #Hacker
337 boosts · 167 favs · 15 replies · Sep 7, 2026
#hacker#hacked#privacy#security#opsec#infosec
@[email protected]
IMPORTANT MASTODON PASSWORD SECURITY/PRIVACY ISSUE… ⁠---- For everyone: If you are using the same password for Mastodon that I use, CHANGE YOUR PASSWORD NOW. It's my password, and I call dibs... Hint: h*****2
40 boosts · 1 favs · 29 replies · Sep 8, 2026