Is Mastodon Safe? Security Review
4/5
Overall Safety Score
★
★
★
★
★
Verdict: Mastodon is one of the most privacy-respecting social platforms available. The main security risk depends on which server you choose, since server administrators can access your data on their instance.
Mastodon is a free, open-source, decentralized social network where users join independently operated servers (instances). It has no advertising, no algorithmic feed, and no corporate data collection.
Security Ratings Breakdown
| Category | Score | Rating |
|---|---|---|
| Encryption | 3/5 | |
| Privacy | 4/5 | |
| Track Record | 3/5 |
Security Features
- Open-source and publicly auditable code
- No advertising or tracking
- Two-factor authentication
- Post visibility controls (public, unlisted, followers-only, direct)
- Content warnings and filtering
Privacy Concerns
- Server administrators can access unencrypted data on their instance
- DMs are not end-to-end encrypted (visible to server admins)
- Federated posts are distributed across servers you don't control
- Small server operators may not have robust security practices
Past Security Incidents
- Individual Mastodon servers have experienced breaches and downtime
- 2023 security vulnerability allowed account takeover via carefully crafted links (patched promptly)
How to Stay Safe Using Mastodon
- Choose a well-established server with clear moderation policies
- Enable two-factor authentication
- Don't use DMs for sensitive information (not encrypted)
- Keep your Mastodon app updated
Safer Alternatives
- Bluesky (different decentralized approach)
- Misskey (alternative fediverse platform)
Last updated: February 10, 2026